It says something that the a7R IV, which brings with it an easily handheld form factor, a vast lens selection, and the ability to capture just about any subject, from scenice landscapes to professional sports, is downright competitive with medium format systems in terms of pixel count.
60.2MP full-frame imaging; 10fps Raw capture; Real-Time Tracking autofocus; 5-axis image stabilization; Big, crisp EVF; Tilting touch LCD; Dual UHS-II slots
Lower-pixel cameras are better for video; Phase detection doesn't extend to edge of frame; Big file sizes