During the Cell Saga when Gohan had to fight cell on his own, Android 16 caused Gohan to become the most powerful form of any Saiyan of any SSJ, no questions asked. Even though, according to numerology, SSJ4 would be supposedly more powerful because it is a harder level to obtain, to the naked eye, there was no more powerful person than SSJ2 Gohan.
Watch these clips and you will understand.
And if I could do this to anyone who looked at the missus, woah boy would she never be looked upon again!
I doubt anyone is gonna watch an hour+ of youtube videos coming from one thread, but if you do, I commend you for your DBZ loyalty.