The R6 Mark III has IBIS, so that point’s off. Canon’s lineup is just segmented now: the C50 is the pro cine body, while the R5 and R6 series are prosumer hybrids.
I’ve tried both the ZR and R6 (mk2) back to back. The ZR looks cooler and that big screen is gorgeous, but ergonomically it’s kinda average: very thin, shallow grip, no EVF, cheap buttons and a menu system in dire need of a revamp. Lack of DCI, open gate and meh exposure tools on the ZR is what bugs me most. Overall I still really like it for its streamlined compactness and big display but it's clearly a first gen product. The Canon feels faster, more natural, and better balanced once in hand for hybrid usage.
That said I admit the R series design language has zero mojo compared to the cine oriented C50, FX or ZR, but the R6 III is far from crippled. It’s balanced, feature complete, and a solid proposition in today’s mid tier hybrid market. The real genius move I think is launching it alongside that super affordable 45mm f1.2 where other brands keep pairing slow zooms as their kits.
Side note but speaking of sex appeal the camera that really had me drooling at the shop was the Sigma BF. Totally unpractical form over function design but that heavy solid unibody paired with minimal clever UI make it one of the most unique and oddly inspiring designs in recent times.