I just recently bought a K1, to say it’s a disappointment is an understatementi.
It doesn’t focus properly.

I love street photography with my 55-300 . To get a nice vantage point and take shots from a distance, with copping,a single shot may yield more than one image.
To capture people as they are,without a camera in their ken is sort of like treating people shots as nature shots. If I could only carry one lens it would be my 55-300.
I always carry three lenses though , in my backpack. A 100mm Macro, a 14mmf2.8 and the 55-300 .