I would add that new experiences are wonderful things.
The big, thick, stiff and chunky focus of my Pentax 55mm lens is an experience far removed from the snap-and-go lightning focus of my EOS1N. That only requires the shutter to be pressed, an Av to be checked and it's "GO!".
Sing to another aria: I get all touchy-feely and involved with the big 67 format (and it commands attention wherever it goes), but the oft-derided by digimons 1N has a defining "stand there and gawk" presence, "The One" that has produced almost countless images printed to Ilfochrome and framed. So it has great sentimental, if zero cash value. My behemoth 67 is "unproven" in this regard because nothing from it has yet been printed and framed (ah, but it's going to catch up pretty darned soon). Even the Zero Image pinhole, taking anything from 6x4.5, 6x7 to 6x9, is again, far removed from any of the other "big guns" in operation and produces beautiful images,many of which have been printed and framed. Experiment with, and get to know many formats and their qualities, but don't ever, ever ditch one in preference for another. Others here no doubt echo this, and it can't be repeated often enough.
This thread is going to have a Biblical quality about it, I can see that. It is a "must read" for those considering jumping from one lily to the next.