To be honest, you'll be pretty damn impressed with what you can accomplish with MF. I have gone up in down in size and find beauty in all of the formats. Look at it this way, good Hasselblad lenses on modern film can resolve about twice the LPMM as most LF lenses, so you don't really lose all that much in quality (oh no, can of worms!), but the real delight you'll have is seeing photography from a more mobile platform. You'll probably end up taking shots you normally wouldn't have done with the 4x5 setup. Just think of it as an opportunity to reinvent your photographic self!