FWIW, I normally fit in Bonanzas with plenty of room above my head, even with the seat all the way forward (which is my preferred position ).
But.
I have flown in one in which my head was bumping the cabin roof badly, and my knees were so far up that I had a hard time even handling the yoke on landing, as my legs interfered with its motion. As it works out, the beautiful interior had been redone with very high density foam, and built up a fair bit as well, and the seat was simply making me sit up a lot higher than normal, or (IMHO) wise.
It was also not particularly comfortable.
YMMV, but in general, a Bonanza should be able to be reasonably roomy for most builds, but it can never measure-up to the size of a Saratoga, Six or Lance.
I found the Malibu adequately comfortable, assuming you can manage to remarkable gyrations called-for to actually get into the cockpit, assume the Matix is the same.