PENTAX Zoom 90 - a bit disappointing --

I was given a PENTAX Zoom 90 by a Camera Club member some years ago and just found it in my cupboard so thought I would try it out with some KB200 cut from bulk that I got from my Deceased Great Friend via his Sons --- Results were mostly not sharp, badly focussed where I was taking Street Photos at 'Waist Level' and even where I held it to my eye some were not sharp . I also tried the fill-in flash.
Here is a sharp one of Grafitti


this Street Candid at waist level not bad


Romford Market in The Rain -- candid not really sharp


Good Light + Flash not really sharp


Bloke on E-Scooter not really sharp


Flash + Daylight - not really sharp


This was the 'Best one' of all the tests = i held a Yellow Filter over the lens as well