So today I've been playing with GFX100s RAW files sent on from
@LongLensPhotography who hired one.
The extra 50mp over the 645z is nice - I thought it would have more detail actually given the jump in MP's - it is there but not to the extent I would have expected. I don't feel short on pixels with the 645z.
Pluses.
I couldn't see PDAF banding or stripping. I was expecting to be able to see it. This is an non issue. Same will apply to the Sony A7RiV. I've made noise about this in the past. Totally ignore me, non issue - use with confidence.
No sensor dirt and I could see at least two lens changes with his time with it. None at all. These are very well sealed indeed and vastly superior to any other camera system I've seen in this regard. My Nikons all sucked dirt in, even the 645z the odd one get through the sealed 28-45 and the others are in the dust sucker category.
Colours and dynamic range. In practice just as good as my 645z. These are nice clean files entirely worthy of a body costing £5500.
The 23mm lens was sharp everywhere and will offer a wider field of view over the widest lens in my set up. That lens is good and worthy of its relatively modest price tag.
Downers. 32-64 is a piece of s***. Dreadful at 50mm in the sides - actually unusable and worse than some budget full frame lenses. I would say this is a really lowsy lens. Not remotely in the same league as the 28-45 from Pentax - not remotely in the same price bracket and it shows. You are better with a lens that costs £5000 that actually is perfect rather than one that costs £2200 which is utterly hopeless. It was not even in the same league as my old Nikon 16-35 which I would rank as pretty lousy. I've now seen two sets of sample images to know that this lens is a pile of complete and total crap. I imagine this how crappy lenses like 17-40 L performs. It is a pile of junk made for crap amateurs who have all the gear and no idea.
Hot pixels - there seemed to be a massive number of them in a 60 sec exposure - certainly in the 100's. Even on a 1/25th sec exposure I spotted several. This is a rental camera so it could be shagged from poor use or a feature of having the sensor always on if you are using the EVF - a bit like using live view on a DSLR constantly.
I've yet to see 45-100 sample images and 100-200 sample images but thoughts would be just to buy the expensive primes on this system.
I won't be defecting anytime soon and never ever if Pentax make a 100mp version of the 645z.