My buddy makes photos that are just as good as mine with his $125 camera, as opposed to my $1200 camera. Its clearly not just about the camera once a certain threshold is reached regarding lens and focal plane performance, in a given format.
It starts to come down to ergonomics, literally how a camera feels to work with. Whenever I shoot with an unfamiliar system, I have noticed that I really can't make much of a judgement until I have worked with the camera long enough to be used to how it feels. At that point, I can begin to be somewhat objective.
Also, it could be that what you are craving is a little 4x5