Don't forget that like the Sherman, the T-34 was just as adaptable - beng much upgunned - taking the 57mm, the 75 to 76mm and ultimately after 1943, in larger numbers the 85mm. This evolution rang alongside the improvment of the ergonomics of its design for its crew and mechanical efficiencies.
The Original T-34 did a colossal route march if I remember rightly - covering one helluva distance (i have the details somewhere :/)
It also provided the chasis for the other Russian Spg's.
Thats another bonus of the T-34 that in design terms matched the sherman (and thats without the aforementioned +'s of curved armour, tracks, speed etc).