A7S: APS-C crop mode vs. full frame quality

[Adam_Weinberg]

i'm wondering if there is a consensus yet as to whether the A7S's video quality is clearly superior in crop mode vs. full frame - i've been looking for a thorough test but haven't come across any.

 

from what i've observed it seems as though the crop mode is slightly more detailed while being slightly noisier, but it has been hard to judge based on compressed uploads. would love if someone could confirm or debunk this.

 

i ask because i'm trying to determine whether or not it makes more sense to get a speed booster for use in crop mode or a standard EF to NEX to use in full frame mode - quality is far more important to me than rolling shutter issues as i will mostly be using the A7S as a locked down camera.

 

also wondering if it's consistent between video mode and stills mode.

 

any tips would be greatly appreciated!