I did think of the H5D-40, 50, 50c and 50c WiFi as I was studying which way to go. I ended up going with the 40 for a number of reasons:
The 50c & 50c WiFi have the CMOS sensor, which gives much better higher ISO; but as I am predominantly into landscapes, I don't want anything more than an ISO 100
... would have loved it if the 40 had ISO 50, but the lowest it goes to is ISO 100.
Another factor, cost ... the 40 is just a bit over £7,000 whereas the 50, 50c and 50c WiFi are over £19,000; that's more than double the price ... do they have any other feature that I would need? Well, 50MP is 10MP more than the 40, but coming from the D3x and D810 a 40MP is more than enough. The CMOS sensor doesn't appeal to me. WiFi, great if you want to tether to an iPad and iPhone, otherwise a useless feature that just eats battery life.
I live in Saudi Arabia, and on the first outing with the 40 (keep in mind it's summer and temperatures are hovering around 50C); the camera overheated and gave me a heat warning
... I called it a day after an hour's shoot. But, I do intend to take it out a lot more over the next few weeks, at sunrise and sunset, when the temperature is a bit more forgiving.
The H5D has a lot better weather sealing than the previous iterations of the H series; and you're able to remove the rear sensor without having to take apart the viewfinder (great for if you need to clean the sensor); it also supports the new battery which gives a bit better battery-life, but if you're using the GPS that eats battery like crazy. Overall the H5D seems to have a LOT less glitches than the H4 and earlier models; touch-wood.
Without a doubt, the Hasselblad has a lot less features than the Nikon, is a lot heavier & larger physically, the lenses are monstrous by comparison, and has gigantic image files, a lot slower (I thought the D3x at 3fps was slow, welcome to the world of 1.5 fps). This has meant I have had to replan my workflow, how I store my gear, how I carry them, what I carry, etc. You really need to take a step back and spend some time thinking about the whole process from A-Z.
There were two main selling / buying point for me; 1) was the T/S adaptor, which works like a charm. It is just an amazing bit of kit for controlling perspective and depth of field' 2) sensor size, and while I would have loved to go for the 60MP (there is a 100MP coming out soon), I just can't justify that kind of price given the kit I was looking to buy (2 bodies and a few lenses) .. the 40MP will easily give you 3' x 3' frames.
I thought about the other MF, Leica (I use the M range for street photography; and the T for my wife); thought of the Phase One, Mamiya, and Pentax; but in the end nothing comes close to the image quality from the Hasselblad, but that comes at a premium.
The store I deal with is Richard Caplan (London Pall Mall), and they do trade-in if you so want; or they can agree with you on a price for your gear and you put them up there for sale with them taking a %. I opted for this option as most of my gear was sold by myself and what was left I had it priced at a bit below eBay prices to move them quickly (and sure enough most were sold on the day they were posted on their site).
Hope this helps ... as I said, if you have specific questions, please feel free to ask
