@jng LOL I wish I could justify the IQ4 150 - and even though I could somewhat justify it based off of how business is going and the assignments I get. The insanely high quality would be overkill - even for the the highest profile campaign photography
. Also yes, the cost situation would change drastically haha. I wish that wasn't a thing though lol. I'd walk down to the dealer right now if I had that kind of money on hand.
I will test the waters with a 60 back and see how that goes, possibly working my way towards the higher res backs. Though the IQ4 backs aren't compatible with the RZ67 sadly - only through workarounds which I really wouldn't prefer as that takes away the true function of the adapter and combining old and new.
What does really help is that you yourself and what I've read quite a bit, is that the CCD backs do have that 'magic touch'. I've shot a couple of campaigns on a (rented) IQ280 back in the day (amazing) and once a personal project on the IQ250 < this was disappointing to be honest. But back then I didn't realise fully that this was a cropped CMOS MF sensor.
I love the GFX and the wonderful 100 megapixels it churns out but to be completely fair it feels like an amped up Sony sensor. Not necessarily exactly the same but the colours feel 'off' like they do with the A7R cameras. Too 'digital' for me. I use a color checker too if necessary but in a pinch I feel like I need to 'de-digitize' it quite a lot to make it feel nicer.
Getting closer though. 60 megapixel back it is. Now just see which one pops up for the best price soonest. Hehe.