Some people prefer big pixels. My conviction is that in the sensor + lens system, it's better to have more Mpx than the optics can resolve, than having more optical power than the sensor can capture.
First reason is you pay the extra sensor resolving power once, and enjoy it with any lens. Second is more real information can be captured with good optics, and less possibility of moire artifacts.
The only disavdantage I can see is a higher need of resources (camera and computer CPU and memory). Even noise and dynamic range don't seem to suffer when smaller photosites are used.
Test:
- 24Mpx FF camera: Sony A7 II vs
- 61,5Mpx FF camera: Olympus E-P5 (same density as a 61,5Mpx FF camera)

Same lens, scene and aperture: Canon 24mm TS-E II @ f/7,1:

200% crop on 24Mpxv FF sensor:

200% crop on 61,5Mpxv FF sensor:


Oversampling avoids moiré and captures much more real detail with optimum lens and shooting conditions.
PS: RAWs look dull because were developed 100% neutral (no bright, contrast or unsharp mask). Once they are processed capture quality arises:

Regards
Enviado desde mi PRA-LX1 mediante Tapatalk