About the AKG Y50, they do have a lot of clamping force. But they sound good. Not comfy.
M40x and M50x are not that comfy. Forget about it.
Sennheiser Momentum. Comfort is OK. Sound is perfect.
I would honestly get the Sony MDR-1AB for 140 euro:
The comfort is supreme. They sound excellent, especially on vocals. You can fold them flat and carry them around easily.