Folks sorry, screwed up last time, so here same post again!
As I am asked for what I finally decided, let me summarize like this - and keep in mind that this is just what I can judge from working with several equipment this week, and have a quick look into the files, as we did literally not have much time left between shoots
1) Sony: I must admit that I am surprised how well the Sony files look like. Especially if you use the right exposure in combination with Zeiss glass, this is a clear winner combination for me when it comes to ultimate IQ of todays FF DSLR.
2) Phase: Having said the above WRT Sony, if you compare the Sony results with any Phase back I used (P30, P40, P45, P65), then each of these backs just blows you off the socks. Of course only if you also do proper exposure etc. But the richness in detail, microcontrast (which was compared to a bit Vaselin look of the Sony files compared to Phase if you compare 100% crops) and the dynamic range of the Phase is a different world.
3) And now my advise - never ever try Tech Cameras, as this might get you hooked into a totally different world with such unexpected results that I cannot describe
. I had the pleasure to test the Cambo Wide RS with a 35mm Schneider lens, so all the Tech Camera shots from my you will see were taken with that camera and most times P40 and P45. Man this combination is wonderful. Once you get over the initial issues how to handle this and get a bit familiar with some workflow, especially if we talk about stitching, this delivers such stunning results I cannot describe with words.
Better see example below - Cambo with P45+. Not done any corrctions other than LCC. The original is 400M TIF file and you can do anything you want with it in PS. So whatever correction necessary I mean. But I think it is already pretty cool out of the box....
Now what are my plans? Not 100% sure yet but most likely go for a P40 or a P45 (I must say I like how the P45 draws) and then get a Phase body with a 28 and a 70-150 to get started. And then go for a Cambo Wide RS. That could be a winning solution for me - not my bank account though