Update: When this story was first posted, there was an error with the axis scale/bar size on the above graph that made the PS4's sales look smaller than they are. Ars regrets the error.

Last week, we waded into the somewhat murky waters of console sales number reporting. Our estimate was that Sony had at least 59 percent of the market share in the battle between the PS4 and Xbox One. Since then, newly released numbers, plus a new look at some assumptions about the Xbox One market, have us revising Sony's share of that market upward. We now think it's in the 65 to 67 percent range.

The revised numbers come in part from Sony's quarterly report, which shows that an impressive 13.5 million PlayStation 4 systems have been shipped in the period from the system's launch late last year through September. That's up substantially from 10 million systems sold to consumers through mid-August, suggesting that PS4 sales have picked up considerably during September. Perhaps the the high-profile release of Destiny and its PlayStation-exclusive content has something to do with that.

(A note on "shipped" vs. "sold to consumers" above: while this is not an apples-to-apples comparison, retailers tend not to order shipments of consoles unless they plan to sell them to consumers in the next month or so. To adjust shipment numbers, then, remove up to a month's worth of estimated sales across the board, or simply consider the "shipment" numbers roughly equivalent to the "sold to consumers" numbers about a month later. The rest of this article deals in shipment numbers exclusively).

Getting a read on total Xbox One shipments remains trickier. To recap, we know there were five million Xbox One units shipped worldwide through mid-April, and 3.5 million combined shipments of the Xbox 360 and Xbox One in the April to September period.

In our last analysis, we were extremely generous to the Xbox One, assuming that Xbox 360 sales had cratered to one-third of their 2013 levels, meaning that the bulk of the combined sales went to the newer system. The intent was to show that even with the most optimistic assumptions for Microsoft (and the most pessimistic for Sony), the PlayStation 4 still had a solid market share lead.

Looking back, though, we probably went a bit overboard with our generosity toward Microsoft. Looking at sales trends for previous years and previous systems near the end of their lives, it's safer to assume that the Xbox 360 is selling at anywhere from 50 to 80 percent of its 2013 levels this year. That means Microsoft shipped between 1.15 and 1.8 million Xbox 360 units in the six months from April through September, meaning there were 1.7 to 2.3 million Xbox One shipments in that time. That gives us our final estimate for total Xbox One shipments through September: 6.7 to 7.35 million.

Earlier this week, we also got updated numbers from Nintendo , showing that the Wii U has shipped 7.29 million systems worldwide since launching in late 2012. That's a surprisingly strong showing for the system, driven by a 143 percent increase in shipments during the April to September period compared to a year ago ( thanks, Mario Kart 8 ).

It also puts the system at rough life-to-date sales parity with the Xbox One, suggesting that wary third-party publishers may indeed want to give the Wii U's consumer base a second look now that the system is selling better, as Nintendo argued would happen back at E3. Diving into the recent sales numbers, though, we can see that the Wii U still lacks the momentum that it needs to hold pace with Sony and Microsoft.

Based on our estimates of Xbox One sales and the Wii U shipment numbers provided by Nintendo, the Wii U has sold anywhere from 47 to 66 percent as well as the Xbox One in the April to September period. It's possible this ratio will change with the holiday season release of Wii U exclusives like Bayonetta 2 and Super Smash Bros. for Wii U. But the Xbox One has well-received exclusives like Sunset Overdrive and Forza Horizon 2 to drive its own holiday sales. Based on current trends, we expect the Xbox One to surpass the Wii U's installed base relatively quickly.

Regardless, both Wii U and the Xbox One sales have been absolutely dwarfed by the PlayStation 4 in recent months. The PS4 has shipped roughly 63 to 68 percent of all "current generation" consoles in recent months. That's significantly better than the (still impressive) 48 to 49 percent of the shipments that Sony can claim over the life of the current console generation. In fact, the shipment of six million PlayStation 4s from April to September is only slightly below the lifetime shipments for either the Xbox One or Wii U, and that should tell you something about how well Sony's system has been doing of late.

Even with the updated numbers, our overall analysis of the state of the console market is largely unchanged for now. With at least one-third of the two-console market, the Xbox One is still a big enough presence that developers and publishers shouldn't feel comfortable ignoring it. But Sony's dominance over the last six months or so should be worrying for Microsoft. If those sales trends continue—or get better for Sony through the holiday season—the Xbox One could easily end up in the same also-ran sales position that the original Xbox (and GameCube) were in during the PlayStation 2 era.