Too many to quote but thank you to everyone for the continued input and experiences.
The shutter shock seems definitely to be something that decides opinion. I appreciate it being brought up as a possible issues as someone with no experience of the system. I get the feeling it much like the debate with Fuji focus showing its locked on target but then on inspection it's taken the focus in front or behind the subject despite the green box. Plenty swear it doesn't happen. I digress however.
I managed to download a selection of RAWs for the GX9 using the 12-32 and the 8-18 with a variety of settings used but with a max iso of 3200 which appeared very noisy however cleaned up nicely in DxO Photolab using either Prime or DeepPrime NR. All shots unto 1600 seemed decent and with minimal noise.
@woof woof also kindly took the time to send me some shots specifically using the 20mm 1.7 as that lens is what I intend to pair with the GX9.
Alan sent some shots using even higher iso and again DxO happily 'rescued' the 6400 shot and did a good enough job with the 12800 and 25600 shots to make them 'keepers' if needed.
Overall based on what I have seen I am pretty confident in the quality of the files. I appreciate there no reason they wouldn't be good. It's just an unknown to me. (Equally plenty have issue with Fuji files or presume they are going to be terrible t work with based on internet talk).
Have had a little play with highlights and shadows and just general messing with the files and they seem flexible enough should the need present.
I'm no pixel peeper beyond situation like this but files look fine on my computer at 100% as id hope but equally still decent at 200% especially after being run through DxO so likely some room to crop without too much penalty I'd guess.
All files were RAW so I have no idea how the jpgs stack up but I only tend to shoot RAW anyway. I have no doubt they hols up just fine based on the RAWs though.
With regards to body I have pretty much decided to get the GX9 (at this point I'm pretty much certain I will give the system a try) as whilst the issue(s) may or may not ever present themselves to me with the older bodies at this point I want to have the best chance of everything being 'right'.
Having looked at the usual used sites the cost of the GX9 body doesn't seem very competitive vs new, imo of course so I'm leaning towards new in this respect now helped by the fact I have an unused gift voucher for Wex meaning I can get the kit for almost the same price as a used body.
The kit with the 12-32 makes some sense too as my wife will use the camera when I have the Fuji out plus daughter has started to show an interest in using a camera on our hikes so again could be a useful lens to have initially vs a prime. Immediate weakness being the lack of a zoom ring but as they at least are both used to using touch screens on phones to take pictures it will likely to a non issue.
Ultimately for me the intention still remains to use it with a prime though and the 20mm seems to be going for around £150 used and generally out of stock new anyway. If I do go with the kit I will probably hold off buying the 20mm initially and see what focal range I seem to be falling into with the 12-32 and then buy a prime accordingly.
Again. Thanks for all the input and I will be sure to update if/when I do make a purchase.