So because the Russians were better equipped to fight a winter war, the Germans were actually better equipped? Literaly what you are saying, as the reason the Russians were saved, is because their planning and strategy with regards to winter warfare were superior and they took strategic and tactical advantage thereof.
Russian T-34 tanks were superior than most german tanks. The ones they were inferior to, were not produced in sufficient numbers by Germany to make any tactical advantages.
Zhukov out maneuvered the Germans. Summer offensive of 1942 stopped the Germans. They got bogged down in the winter of 1942 and were encircled and an entire German division was effectively wiped out.
Russians successfully gave up land and played for time, so they could muster adequate forces to counter the German forces in key strategic battles.
By 1944, with Operation Bagration, Germany could offer little effective resistance and the Soviet forces steamrolled the Nazis all the way back. Within 10 days the Soviets pushed them back from Minsk to the pre-war Poland border.
They were in Berlin pretty soon afterwards.