Can offer my 2p here, the Manfrotto Quick Release Mechanism Q6 Arca Comnparible Version has a couple of issues (IMO), one of which resulted in the demise of my GFX50S and attached lens.
The first issue which is a minor one, is that the spring release mechansim is susceptible to not working (ie jamming). I had to disassemble mine several times and rebuild it, during the time that I had it.
The second and much more serious issue, is that you have to make absolutely sure that any Arca plate has correctly engaged with the locking mechanism, ie it was fully flat in the base of the head receiving plate. It is possible to position the Arca plate in such a way that when locking the Manfrotto part that it engages with the edge on the end of the Arca plate and not over the edge of the plate engaging with the two flat surfaces. This makes the camera and lens have the appearance of being locked in when it fact its not. I did this, moved my tripod and lost the camera lens 10m down a ravine!!! The camera was on a Kirk L-Plate (so not some cheap chinese knock off)
I like my Manfrotto legs, but I will never buy one of their Q6 heads again, I have put a Benro G2 head on my 055 legs, this has a much better IMO Arca plate mechasim, and the security system, of having to pull and unwind the locking knob is much better than teh Manfrotto Spring affair.
Now this is only my experienece, but I wouldn't be putting an expensive camera/lens combination on a Q6 head.