Ok thanks for that.
I can't be 100% sure it's due to the firmware upgrade but that is the only thing that's changed.
On their own, the images are ok but not great. But when compared with the same shots taken with the K-3II, the difference is clear.

I hadn't set up any lens adjustment but can understand it'd be overwritten.

Hi, has anyone else had any issues after installing the latest update?
I did mine about a month ago and this may just be a coincidence, but have noticed lately how my images are not as sharp as before.
I also use a K-3II and do notice a difference now between images from both cameras, whereas before I couldn't.
Maybe it's not the new firmware, but something's changed on my K-3.
Is it possible to revert back to the previous version and try it on that?
Thanks for any advice.

Not so much of a rush, but been thinking for a while that it might be a good idea to have a second body available. I've now got seven different Pentax lenses bought over the last two or three years, but if a body develops a fault, am stuck.
Plus it seems prices are likely to rise - the 560mm I bought recently has just shot up £700 - and the K-3 is listed as final stock.
But yes I think you're right that it wouldn't be surprising if Pentax released something else.

Good comments thanks.
Think I'll be sticking with another K-3 for the time being and maybe in a couple of years, Pentax will bring out something between that & the K-1.
As for the contacts, yes I've cleaned them since although no idea why I didn't think of it on the day! But I couldn't get a sharp image with MF either so wondered if it might be something else.
I should get in the habit of cleaning the contacts more often anyway.

Good comments, thanks. And I like the food and wine idea!
Not sure that at the moment getting a K-1 would be worth it.
So that narrows it down to another K-3 or K-3II if it's likely to give improved images on the K-3, being a newer camera.
If it isn't, then K-3 it is - and wine and cheese 😋

Thanks for that.
I'll have to do some more research I think. If using some of my current fairly new lenses on a K-1 will only give 16MP then I don't think it worth me getting it.

Thanks for that.
I know the K-3 is being discontinued as the K-3II is there.

But would imagine that even if I only get 24MP with the K-1 at times, the image quality would be better?
I'm told the 150-450mm that I've just bought was designed to be used on the K-1.
Decisions, decisions 🤔

Thanks for that and yes I wouldn't have to learn the buttons all over again.
Still not got the hang on them all on the K-3 yet.
36MP would be great but believe if the lens I'm using on a K-1 at the time isn't full frame, then I'd get about the same as the K-3?