Lens recommendation

[Erikerodri]

They look sharp to me.
Assuming you were using f/2.8 and you were close to the subject, those pictures, IMHO, are well within the accepted sharpness levels.
Btw, I like the last pic of the cat, very nicely composed.

Thanks for the response. I am not sure if i am being too critical or not so it helps. Thanks for the comment as well