goodguy
Been spending a lot of time on here!
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You should watch Tony's video, it will explain to you where you are wrong.Yes, a FF gathers 4x more light than a MFT sensor ... that's because it is 4x larger. Using identical settings on a FF, a APS-C and a MFT sensor .. the same amount of light will be hitting each pixel. It is the aperture and shutter speed which controls light not the sensor.Micro 4/3 are great sensors but there is one physical fact and that's a FF sensor collects 4 times more light then micro 4/3 and there is no way to go around that so getting a micro 4/3 is a compromise compared to FF which has its drawback like much bigger and heavier overall system....MUCH!!!You would be surprised about the high ISO performance of the last micro 4/3 cameras. This is a shot at 5000 ISO (No noise reduction applied). Sure, this is not the ISO performances of the new D750 but it is as good or even better than what my 5D Mark II was outputting. This was taken with the Panasonic GH4.
If weight and size is an issue then micro 4/3 is an excellent way to go but if you like me and you willing to "schlep" your equipment then FF is an obvious winner for stills photography.
You can also put it this way:
Let's say you shoot a particular scene with both 4/3 and FF and you want a particular DoF and shutter speed (surprise,surprise)
With 4/3, let's say, you are using 1.2 aperture and 1/100 shutter speed
With FF camera, for the same scene you keep the same shutter speed, but need to stop down the aperture, because otherwise DoF will be way too shallow. So you stop it down by two stops compared to 4/3.
Strictly speaking that means FOR THE SAME SHOT there will be 4 TIMES LESS light on the FF sensor than it was with 4/3 . Not 4 times more
To compensate for this lack of light, the FF camera cranks up the ISO (or sensitivity) by two stops to extract four times more of the light that fell on the sensor, compared to what 4/3 camera did, and in the end ensure similar exposure.
But then , what is the problem? The FF high ISO performance is great..
f1.4 on MFT with their existing lenses isn't really f1.4