I've used a number of Leica M, R, and S bodies and lenses. Now I shoot stills with an S 007, and videos with a Sony FS7 and A7Sii. I would love for the next S to be upgraded for video. (Someone above mentioned an upcoming one, but that's really based on one poorly translated sentence from an interview with Leica CEO and I think not reliable.) Before that I'm also considering an SL as sort of a combination of the S and the A7S ii. It'd be nice to be able to carry one body instead of two. But after using the S, I don't think the SL's photo quality will suffice for me.
In my mind there's little doubt that Leica gear is overpriced (especially when bought at retail prices) relative to performance. At the same time, the merits and aesthetic qualities of Leica glass + processing cannot be fully captured by DXOmark and other quantitative metrics that naysayers tend to cite. For me the richness and subtlety of the colors are always what strike me. Zeiss glass is sharp, Canon and Nikon glass are sharp, but the colors aren't the same. Increasing the saturation or vibrancy in post doesn't yield the same results.
This is definitely subjective, and much harder to pin down than "sharpness" and even bokeh. But the difference is there in the images, and becomes very noticeable if you use the equipment over a long period. I don't think it's about irrational love for a brand or Leica mythology at all.