Please help - which hybrid camera should I buy? Around £2000

Hello Community 
I've been doing some research for a while now, looking for a new camera that fits my needs. I recently got into producing videos – it's something I always wanted to do but for some reason, it took me until last year to get serious about it. On the other hand, photography has been a dear hobby of mine for many years now with the Olympus OM-D E-M10 as my faithful companion. It takes brilliant photos for sure for a relatively inexpensive camera but now that I've really gotten into making short-films and would love to explore it in greater depth, I'm in need of a camera that can do both really well, photo and video. I'd be willing to go up to £2000 for the right match.

So far I found the following cameras to come close to what I'm looking for:
Panasonic GH5 – brilliant video footage; after looking a bit more into 10-bit vs. 8-bit, I'm certain that I want to go for the 10-bit version and if possible 4-2-2 chroma subsampling as I'm a sucker for shiny colours, I love to shoot sunsets/sunrises and I'm also looking to get deeper into VFX, using green sceens etc. However, the quality of the stills seems quite underwhelming to me. From all that I've seen so far, still images come out either about as good or even a little bit worse than the ones my Olympus takes (especially when capturing JPGs which is my preferred mode, I rarely take RAW photos). If it wasn't for this bummer, I'd definitely go for the Panasonic.
Sony a7 III – after working my way through reviews & sample video and photo material, I was almost ready to go for this one but then discovered that it only does 8-bit 4-2-0 internally which, of course, is not uncommon for cameras in this price class but I'd really love to have the option to shoot in 10-bit and if possible 4-2-2 (see above) without an external recorder.
Fujifilm X-T4 – this one is going to be released at the end of April I believe (hopefully! Who knows with the Corona-crisis going on) but what I found so far seems quite promising. It does 10-bit which is great, unfortunately only 4-2-0 instead of 4-2-2… oh and it has this super handy flip-around rear screen as a little extra   Not too sure about this one mainly because it hasn't been released yet. 

What are your thoughts on the above? Have I been overlooking a camera that fits the bill? Should I invest in an external recorder if I want the higher quality footage (pricey… plus I imagine it a bit awkward to have it attached all the time). I've been looking into mirrorless cameras mostly because I've been shooting with one for 4 years now but I'd be open for DSLR suggestions too!

Thanks for any input, very much appreciated!! 

Since you are already invested in m43 gear, I would go with the Panasonic.