I have couple of RF645 bodies and the 65 and 45 lenses. Smaller neg, but a smaller camera (much more so than the specs suggest). I adore mine and if you want to use it for street stuff to, the vertical finder and more shots per roll, as well as the ability to generate grain on the smaller negs is the clincher. The lenses are really superb, not good, but astonishing and I would bet that they are in the league of the Mamiya 7 lenses.
If you want to save pennies, try Robert White, as he is doing the RF645 with 65 and 45mm for £650 (plus 17.5% tax for UK). That is just a give away.
As much as I like the Mamiya 7, it was too big, had too few shots per roll and the lenses are too expensive. The Bronny is ergonimically great, much more solid IMO, but the neg is an inch smaller ! But look at what you can get for £650...