D700 has a big sensor but less MP. It doesn't matter, I got a Zfc(20MP) for my studio when the photographer complained about our D8xx(36MP) cameras being too heavy and not having articulated screens, and it's been fine so far.
As someone who used to lug around the D700 everywhere I went years ago (I stopped when I got my Olympus mirrorless), this complaint from someone about D8xx in studio use blows my mind.