Towards the end of the war the Soviets were advancing behind a rolling artillery barrage; they weren’t intending to take Stalingrad-level casualties again. They weren’t masters of urban warfare; their commanders simply forced them forward under pain of death.
Eh, not so much for Berlin. And yes, they absolutely were the masters of urban warfare - they knew what defenders could do from Stalingrad, so if they took fire from a building that wasn’t as heavily built as the Reichstag, they often brought up artillery and fired on the building over iron sights at relative point blank with heavy HE. They weren’t even trying to preserve most of Berlin for later occupation.