Panasonic S1R vs. Nikon Z7 vs. Leica SL cameras size comparison

I've never found the SL large in my hands and can't get on with the smaller Sony and Fujifilm cameras, but then I do also use a Nikon D2Xs!
I examined the Nikon with the 24-70 zoom lens a couple of days ago. It is a lot lighter and smaller than the SL. Also, to me it feels a lot more comfortable than the Sony which is roughly the same size. If tests eventually show that my M lenses will work well on a Nikon Z7, it will be a tempting proposition...