Well I haven't rode a Mutt, but I've sat on a Mutt and a Coyote, and the K9 fits me better at 6'2". I feel like I'm sitting "in" the bike instead of "on" it if that makes sense.
You could always get the extended forward controls if it's a foot problem on your bike. If it just doesn't feel right in general than it could be more and ya may be better trading out.
It's like anything. Ya just gotta "try them out" and find what fits you best.
Oh yeah, I also recommend a in depth test drive. That'll tell ya for sure.