Panasonic Lumix DC-S1R
And the cost is a concern. The $3,700 asking price is more than the Nikon ($3,400) or Sony ($3,200) alternatives. A paucity of affordable lenses compounds matters, though that's sure to be addressed as Sigma has announced plans to release some lower-cost lenses in L-mount.
Excellent 47MP full-frame sensor; 5-axis sensor stabilization; Big, sharp EVF; Good control system; Backlit control buttons; Protected from dust and splashes; Top information LCD; 4K video at up to 60fps
More expensive than competitors; Obnoxiously heavy; Contrast focus limits tracking speed and burst rate; Limited lens selection