Finally got angry about lack of 35mm equivalent

i never suggested that there was a generalised problem with wide-open manual focus - it was the specific needs of street photography where i suggested that wide-open manual focusing is problematic. i own the takumar 50mm f1.4. it is a lovely lens - but simply not suitable for shooting moving people in rapidly changing situations.

Peaking is helpful - but not enough when you need to be very quick. Some can manage wide-open focus with a rangefinder - which is actually quite a rapid focus system - but even then there will be many misses wide-open. Even auto-focus will give you misses of course - but it will be the best option.