If one looks at DxOmark sensor scores in the "portrait" category (i.e., the optimal conditions), it has the Phase One IQ 180 medium format sensor ($43,000 camera) rated at 26.5, with Sony A7RII rated at 26, Nikon 810 at 25.7, Pentax K1 at 25.4 and so on. Top cinema camera - not that they rate many - is Red Helium at 27.5, with Epic Dragon at 26.5. This tells me that, with the current technology, the deviation under perfect conditions in a single frame is minimal.
PS. In terms of auto focus, the current sonar or laser aided system counts the distance, thereby allowing the operator/focus puller to dial it in manually off the lens marks. The very high end auto focus systems connect via the remote focus and adjust everything themselves but those can cost tens of thousands of dollars. And Sony already has the technology, though Canon is currently the only company that employs auto focus in its Cinema series (C100, 200, 300, 700).
PS. In terms of auto focus, the current sonar or laser aided system counts the distance, thereby allowing the operator/focus puller to dial it in manually off the lens marks. The very high end auto focus systems connect via the remote focus and adjust everything themselves but those can cost tens of thousands of dollars. And Sony already has the technology, though Canon is currently the only company that employs auto focus in its Cinema series (C100, 200, 300, 700).
