Well, that all depends. 8 Armor on G1, 8 Armor on G2 and you’ll be rolling through Russians like a searing hot knife through butter. Although, the Brits and the Americans will be landing in France and wondering where all the Germans are.
Of course, it isn’t QUITE so simple, but I believe that 8 tanks on G1 and G2 peters out against Moscow. The Allies just have too much power too quickly, with UK attack on Baltic German fleet on UK1 plus 3 fighter build, followed by Allied transports to the German coast, followed by bleeding off of German strength through the Norway/Archangel/Eastern Europe route.
If the Germans continue to produce tanks, they cannot defend against the Allied attack. If the Germans switch to infantry, the attack against Moscow peters out. If the Germans split their income between infantry and tanks, then the German attack on Moscow is at reduced strength while the Allied attack on German territory still overpowers the German defense.