Well some just-frame stuff in tekken is kinda brutal. And before xrd, there was no input buffer, so it is definitely more strict than blazblue or SF4 (more akin to sf3, since original XX was made around the same time.) The technical motion in guilty gear is HCBF, which is why it is kinda nicknamed the "gg motion". But execution varies greatly among characters, from sol and ky who are pretty straight-forward, to nonesense like i-nos chemical love combos that require immense execution for even the simplest of combo routes. It is definitely harder than blaz blue and sf4