The fact that the Soviet 85mm is a mere 3 mm smaller than the German 88 is misleading. The 85 is like most Soviet calibres in that it uses weight of round for penetration rather than velocity and weight. The 85 does not have good range properties similar to the 76mm in the T34/76.
In Aces High, all things being equal, the 88 would be king with the 17 pounder a close second. The 85 is probably a relatively distant third.
Oddly enough the Soviet 85 is easily eclipsed by the 75L70mm used on the Panther tank, a gun that also was more effective than the German's own 88L56. The 88L56 was used in the Tiger one and was a shorter version with a smaller breach that would fit into the Tiger I's turret. The 88 in the flak version and later in the Tiger II, Nashorn, and Elefant was the 88L71 which was the best tank gun in the war.