They feel different
Mk1 better size
Mk2 better buttons with led.
Also the distortion on the mk2 is cool with its new screaming possibilities this makes mk2 more outgoing than the introvert mk1.
Also, but i am not sure cause i sold my mk1, i think it is easier to get better low end. In ob it doesnt matter but standalone it does matter.
I.e. Once i recreated kick the gut on mk1 but with no succes
Both cool though