I've seen two T-34s up close, one in the Imperial War Museum in London and the other at Bovington. Both were post-war manufacturer /85s, and as I remember, the surface of the turrents was extremely rough. In some places, you could even see where a grinder had been used to round off the bends and remove large burrs. The hulls were somewhat better, but lacked the unblemished surface of most American, British and German tanks.
I have the Trumpeter 1942 model, and after comparing it with a number of photos, I'd say it's pretty good in this regard, although a few additional dings and gouges wouldn't hurt. I've heard that workmanship varied considerably from factory to factory.
I'm hoping Aber will eventually come out with a PE set for the fenders and tool box. The tool box on the T-34 in the Imperial War Museum has a gouge in it that appears to have been made by either a bullet or shrapnel. It would be fun to try and duplicate this feature, but in order to get an accurate look, you'd have to use PE.