Relative to the German forces deployed at Kursk, there were only a handful of T-34s listed in service. According to Jentz, only SS Das Reich had any T-34s listed in the OOB (25 as of 1 July 1943). This unit was engaged at Prokhorovka but I'm not aware of any outstanding contribution by their T-34s. Other German units had T-34s listed at times and, presumably, these vehicles were captured during the fighting. According to Zetterling and Frankson, 6th Panzer made good use of 2 captured T-34s in a "ruse" to capture a bridge and establish a bridgehead over Northern Donets on 12 July (leading a German column to the bridge pretending to be a Soviet column). Overall, I'd argue captured T-34s were more useful for deception during operations than for battle. And, given the two-man turret, it wasn't that great a machine (though I believe the Germans at least added radios so there's that).
Zetterling and Frankson, Kursk 1943
Jentz, Panzer Truppen 2