All of those photos show that you do not yet have the experience and knowledge on how to take stunningly sharp photos. So yes, you have wrong expectations considering the conditions you are shooting in and the skills that you have. Nothing to worry about, you can build on those. Sharpness is something that
does in fact come from skills.
Some pointers:
a) light is king. If you are shooting in low light on an overcast day, the photo will look dim, featureless, with no shadows, no 3D pop, no real detail
b) ISO, shutter speed, aperture. These three settings let you take sharp or blurred photos. High ISO means more noise, which at 100% crop looks terrible. Shutter speed can let you capture motion blur, but it can also capture handshake blur, etc.
c) You need to learn how to achieve focus correctly. No, it is not just "point camera and press button"
d) Learn how to properly hold camera and press shutter, or use a tripod with 2sec timer option. PentaxForums made a blog post about this some time ago:
https://www.pentaxforums.com/reviews/long-exposure-handhelds/introduction.html
e) Shake reduction needs a moment to activate. When you half press the shutter, keep holding it for a bit and a little SR icon will light up in the viewfinder.
f) You are taking photos of a leaf. What do you expect to see? If you want to see the closeup texture, then you need a macro lens or microscope. You cannot expect to see results that will not happen at that distance, with that gear. Move closer, make sure you don't violate the minimum focus distance, place the leaf in an attractive way, add a spotlight coming from the side, use fill flash, ISO 100, f5.6, tripod, 2 sec timer, select a good WB, then show us the photo. If you handhold camera, with an ancient lens*, shoot though a window, on a dim day, with slightly off white balance.. well, what did you expect to see?
Test photos should be taken in good natural light, using a tripod and 2sec timer option (or remote trigger), live view with focus peaking and digital zoom for manual focusing, lowest possible ISO and various aperture choices (different f-numbers on a given lens will give you different DoF and resolution, which affects perceived sharpness).
Anyway, keep shooting and learning.
*I like old ancient lenses, but they are not all very sharp. Or sharp at all. You have to really adapt to these lenses to squeeze out what you want. If you want to simply point at something and get decent photos, then you need a modern prime lens. Old lenses are a lot of fun and can give you things modern lenses don't - but they are difficult to use and will only rarely beat new lenses in terms of resolution, flare control. contrasts