If you're comfortable with that size and price point, why not get a 645Z for a few hundred cheaper and enjoy the utmost image quality out of a digital camera as of October 2015? ...
I owned and used Pentax 645 equipment for three or five years. I also currently own a complete set of Leica R lenses from 19 to 180 mm, and two Leicaflex SLs.
- When it comes to lens performance, the best of Pentax 645 lenses is quite good but doesn't hold a candle to what I get out of Leica R lenses. It was the size of the film compared to 35mm format that made a difference with Pentax 645 film gear. That difference collapses in the face of an excellent 24 Mpixel sensor vs an excellent 39 Mpixel sensor. The size of the sensor really contributes in largest measure to DoF control, which I'll give up a little bit of ... But I have faster R lenses that are more compact than 645 lenses.
- The size, weight, and proportions of the Leica SL are within a couple of millimeters and grams of the Leicaflex SL, which just happens to be, for me, one of the absolute best, most ergonomic cameras ever designed. It is to me a much more balanced and handy shape than any Pentax 645 has ever been, including the 645Z. All the Pentax 645s have been somewhat boxy and ungainly in the hand, and the lenses are large, heavy and expensive.
- Having had a good bit of experience with Pentax over the period from 2004 to 2010, I have to say I simply don't trust them for service and support. I've been dealing with Leica USA for almost forty years: They have always provided me with outstanding service and support.
Don't get me wrong, the 645Z is a fine camera and very reasonably priced for a medium format digital. But, for me, the Leica SL poses significant advantages and, since I only need a body, adapter, and a couple of batteries, will actually cost me less—only as much as my Leica M-P did, in fact. The Pentax would cost me twice that at least once I built a decent four to five lens system.
Of course, there's no way to measure "utmost image quality" in any absolute sense anyway, and the Leica SL hasn't shipped yet so doing comparisons isn't really possible at this time anyway. But I trust my R lenses through long familiarity, I trust Leica through long experience, and I can confidently say that I'm sure I'll be happier with an SL than. 645Z.
I'll be in the market for one in about two years. No need to rush or consider October 2015...
🙂
G