This should be a two part question as MK in the arcade was way harder than on console.
On console: 1, 2, 3, Ultimate 3, MK Trilogy, 9
On Arcade: none, but I did get up to Endurance Match 3 several times on MK1
Those are the same ones I have beaten. I am also with you with console/arcade difficulty. If somebody wants a MK challenge, they should try MK games in the Midway Arcade Treasures 2. PAL version of this collection had ridiculously high difficulty even in the easiest settings (harder than on MAME emulator) that made getting past 3rd opponent a real nightmare.