One can hardly speak of original, the cam is a film cam. One would have to digitize it. The RB67 (its mecanical predecessor) can hold 6 x 8 backs......the aspect ratio would match the old monitor format 4:3 used at XP times. So theoretically one would not need to crop keeping the old 4:3 downsize only. Actually most common medium format is 6 x 6 means quadratic.... Those wider formats such as 16:9 and the linked 4k image are definitely crops since they cannot match the original aspect ratio of medium format which is closer to quadratic... I assume there is no direct scan from the original film available somewhere...and I guess there is still copyright. But the 4510 x 3627 tiff is most authentic to me.
@Yen, please look at the attachment here https://forums.mydigitallife.net/threads/the-bliss-wallpaper.77668/#post-1454816 Look closely at the edges, the tiff image and his picture do not match. His has more detail at the edges. Why is that?
When I am back home at weekend I'll take a closer look on my calibrated monitor...also on meta data if available. (If a tiff had been a jpeg already before you can recognize some typical artifacts) Well ..one can save a jpeg as tiff again to create the illusion tiff must be original. But jpeg is not lossless. Same would be to convert mp3 back to .wav again. The original is on film. And the specifications of medium format say it's close to a quadratic aspect ratio, no wide formats. The quality of a digital image strongly depends on the used scanner and its optics. Also if it had been developed as negative or diapositive. Somebody had to scan it to get it as digital image..that's sure And I bet there are some manipulations at greens and blues.