Kai Wong is disappointed by the manual focusing speed with high speed lenses that are demanding. Says it needs a split image or picture in picture mode.
Someone doesn’t understand the difference between an optical or electronic viewfinder. You would be well served to ignore the opinions of those people.
He seems pretty on top of things. Focus peaking doesn't cut it and magnify mode is too slow.
My experience from using adapted M lenses on my SL2 is: magnification plus peaking is the best way to go. With more
characterful fast lenses peaking might not be triggered at wider apertures, so you'll need the magnified view. And if you're stopped well down you may get so much peaking that turning it off and relying solely on magnification will work better. The EV1's magnify function should be instantaneous if you're using the repurposed frameline lever to switch it on/off.
I find in most cases using the highest magnification level and pinpointing the most important part of my subject along with moderate peaking gives me the best results.
Also, it took me a number of trial runs over the course of a week with adapted lenses on the SL2 to really get the hang of this. I wouldn't take the conclusions of anyone too seriously who hasn't spent a good amount of practice time with the EV1.
As for overall focusing speed, in my experience the rangefinder beats the EVF in the 21–75mm focal length range. But I've been using rangefinder cameras for decades, and RF focusing is second nature.
I took the pic below during one of my early adapted lens outings, with a Zeiss-Opton 85mm f/4 via magnification plus peaking. Lens stopped down to f/5.6 and focused on the heron's eye. This version of the pic is a full-res crop. I was easily able to track the heron as it waded around looking for something to swallow.
-Dave-