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This is where it gets complicated. The ESO 2.2m is a F/8 with what I can figure out as 15.27 micron pixels (125x125mm 67megapixel sensor). Mike has a F/5 with 9 micron pixels.
In faint nebulosity the 2.2m only collects an estimated 12.5% more light per unit area. This however doesn’t take into consideration QE, the reflectivity of the ESO mirrors or scatter (the FSQ would have about 95% transmission given high quality coating and minimal dust). Given ESO likely recoat their mirrors and there is likely several corrective lens in there as well, ESO could have a 20% transmission loss without taking QE of the sensor into account.
On non stellar objects ESO and Mike are neck a neck in depth BUT ESO 2.2M does that depth at 0.18”/pixel... which is pretty amazing!
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