Canon came up with that first with the 5D back in 2005, and it came to the semipro lineup with the 40D, and the full pro with the 1Dx. Currently, everything fro

Canon came up with that first with the 5D back in 2005, and it came to the semipro lineup with the 40D, and the full pro with the 1Dx. Currently, everything from the 80D and up has this. Nikon only has had it on their midrange models starting with the D7000. The D6x0 and D750 have it, but the full pro style cameras don't have it.