Too much. Turkey's core territory in Anatolia should probably be kept except the Armenian area. It still depends on what happened in the war such as how Turkey treated British POWs for example.Why not have Greece acquire all of the Turkish coastline from Zonguldak to Antalya and expel all of the Turks living there?
The US had no territorial interest in Japan or Germany nor did its Western allies. France got its territory back. Japan or Germany is not comparable to a pro German Turkey in WWII. Except for the Anatolian core, these were conquered lands beginning with Constantinople.