From what I can tell, the issues with the turret come from three separate things.

Firstly, the area I have marked red seems to be absent on the IRL tank. There doesn't seem to be any sort of raised thingy around the bottom of the turret.

Secondly, WG made the blue part just look fat. On the IRL 4202, the gun barrel gets noticeably thicker closer to the turret. In game, it's hard to tell if that's either not even modeled or if it's just modeled so poorly I can't tell. The area around the gun mount looks like it should be more "streamlined" too. The game model has clearly defined edges and looks a bit fat, but IRL it's a lot more smoothed and just overall is nicer to look at.

Lastly, the raised area behind the MG is way too long in game too, which leads me to believe the upper slope is wrong as well. This is backed up by the fact that the turret sides on the game model have basically zero slope to them, when it should be closer to something like 40° roughly. Funnily enough, the turret sides looked just fine on the old model (which was also a gigantic [edited]mess). It's hard to compare actual proportions without being able to have some blueprints or something to compare the game model too.

Spoiler Disclaimer on this second picture: These values are wrong, but the lines are what I'm trying to show off.

The harsh edges on the game model isn't an issue with bad lighting. I compared it to garage screencaps and it's not much better.

TL; DR

WG is still crapat modeling and is making sexy tanks look ugly by stretching them all out and making them look like potatoes.