I agree the trigger wasn't up to that of its contemporary German rivals but it wasn't far off and, considering the Mk3 was designed as a sporting gun, was surprisingly good for paper punching.
The Mk3 was the sporting gun and the Mk 3 Supertarget the paper punching match equivalent.
The 335 was a sporting gun and the 335S the target equivalent. I know which I would rather choose between the Supertarget and the 335S.