This is not a camera comparison, it is a simple demonstration of the skin tones reproduction shooting LOG with the native ISO settings and applying the corresponding LUT's provided by both manufacturers. No color grading was applied, only matching levels.
ALEXA: LOGC to Rec709 LUT
F55: SGamut3.Cine/SLog3 to LC709 TypeA LUT
Produced by Sr. Product Manager Juan Martinez
Edited in Sony StudiOne
Colorist Juan Salvo, "The Colorspace"