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Example AF sensitity range:

 

Sony A6000: 0-20EV

Nikon D7100: -2-19EV

 

Now you may ask yourself why's the D7100 so much better in low light ? We are talking about a sensitivity that is 200% higher on the DSLR. Maybe think about the size of the AF photodiodes in these different approaches. 

 

This is a DSLR AF module:

http://imaging.nikon.com/lineup/microsit..._n3_03.jpg

Solely made for just one purpose.

 

Just a technical explanation, please. Thus why is a dedicate AF sensor array worse than an embedded AF sensor array in the image sensor ?

 

I am always willing to learn something new.

 

Pretty much any current mirrorless body focuses fast enough for anything except action photography.

Since I don't shoot action, I'd take mirrorless AF vs DSLR any day for one single reason: perfect accuracy.

Yes, for the majority of shots, what matters the most is AF accuracy. DSLRs suck big time at this since they require body + lens calibration.

I'd never go back to PDAF as implemented in DSLRS. I couldn't care less if they focus in -2 EV given they can't focus as accurately as CDAF in daylight conditions.