[Guest]

I think you bring in a new variable which is output size. But this we don't know when we compare sensors and pixel densities. In my comparison I talk about sensor sizes. If you target the same output size for each sensor, the resolution of the final picture changes.

 

If you use the same enlarging value, it remains with pixel count, you just get smaller output sizes from APS-C - but the resolution comparison remains the same. But the bigger you get, the more distance you need to see the whole picture. And since our eyes also have resolution limits, you will not see  bigger benefit for a certain enlargement, because you are too far away to resolve 300 dpi on 100 inch 

 

What you don't look at, is the loss of Aliasing filters and different color depth of the sensors. This matters as much as resolution, because our eyes can't tell the absolute difference, but the relative difference is visible. So, the 50 MP Sensors of Sony in Pentax, Hasselblad, Fuji, PhaseOne will show more colors than the one from a Canon 5DRS, just because the absolute pixel density of the sensor is lower - and each pixel bigger. Therefore more sensitive and bigger color scale. This is for me the reason to get bored about equivalencing calculations. It's more variables involved in this game.

Actually, I removed output size/ fov as variables in my comparison since I'm comparing sensors based on the same output size and fov.

Yes, I avoided color depth and AA filter discussion, that will complicate discussion

I guess my point is calculating pixels/mm on different format of sensors may be more misleading than you thought