Hello Jono,
I am trying to do the impossible: one camera for all my needs, which are:
1) able to use the excellent CV UWA lenses without tedious PP (cornerfix, etc.)
2) must have 100% accurate focus on a tripod (for interiors and exteriors for architects; and table-top work)
3) must able to be focussed from above (can't get behind an M9 when it's on a tripod in the corner of a room)
4) be small, so carry everywhere
So, the GXR ticks more of the boxes for me. I have though about an M8, but understand that they need to have IR cut filters (I shoot a lot of fabrics in the interiors). Is there a right-angle finder for these bodies? Too late after a job to realise that you haven't nailed focus (tho', I agree, distance focussing plus ƒ11 works perfectly on the CV 12/5.6).
And the GRX is a delight to use with any lenses I have for it, table-top-wise, AND its built-in flash triggers my strobes (one of the reasons the NEX7 was a non-starter; the other the non-tiltable EVF; the other the corner and smearing problems with the CV UVAs).
I have been looking again at the 5N, while waiting for the same sensor to come out for the GXR. IQ wise with the UVAs, clearly great, and it has a tilt EVF, but no inbuilt flash (but can take a Hawke's helicoid!).
I have one of the X-Pro1s on order, but: needs aftermarket dioptre correction; this means my assistant can't shoot with it; it has no focus peaking (but I recall your remarks re. ease of focussing the NEX7 via magnification only), and neither a tilt EVF nor a swivel LCD, so although I think the rest of it is lovely, I will be back to two systems... which I do not want.
No, the GXR is it for now.