I was intrigued by two thoughts that Jono's article brought out. One is that he feels there is a gap opening up between the quality of images possible in micro 4/3 (of which the Olympus E-M1 mk ii is the 20 MPx standard-bearer that he knows well) and in APS-C with the T. The comparison should really be extended to Fuji's recent X-Pro2 and X-T2. And T lenses on the SL, which for stills becomes an APS-C camera with 10 M big pixels, like the Sony Sii. Second, that the T lenses are an unappreciated contribution to the portfolio of L-mount lenses -- affordable when you find them, sharp, with fast AF and Leica color rendition.
I still find the TL2 and the complete TL system from Leica pretty uninteresting to say the least. And the TL2 did not change anything for me unfortunately. It is an interesting camera concept and I do not say it is bad, but for the price they ask and the TL lenses available it is simply a no go for me.
WRT IQ I am very fine with the output of my XT2 and for what I need and shoot the X system has simply much better choices when it comes to lenses. For when I need really compact then m43 is my way to go and especially pairing the EM1.2 with Olympus pro lenses shows very high IQ. But there is definitely a noticeable difference to the output from the XT2 - for my eyes it is miles better than any m43 system can deliver today. This is actually one of my problems as I so often wanted to get rid of the Fuji, but the great IQ always keeps me back in the X-camp.
Clearly FF has some advantages but also disadvantages and for the time being I can not identify any FF (mirrorless or mirror) system that would suit my needs and desires. So APSC is currently the sweet spot for me and the photography I do.
Abit OT, but interesting to mention in this context:
I am kind of interested in the new mirrorless FF Nikon that is rumoured to be coming. If Nikon finally get it right with a pro-level mirrorless FF body ala Leica SL and make this compatible with most modern glass for the Nikon mount then this could very well become the FF mirrorless solution I am waiting for. At least at this time I would then have to get rid of the X-system and keep only FF-mirrorless Nikon and m43.