The camera belongs to my cousin who lives near ISB. The difference in sharpness you see is due to the selection of Lens and the user's style.
You can get the same sharpness but you will have to spend on better lenses. The 135mm is sort of Jack of all and king of none. It gives you more options but lowers cost and quality.
I myself live in RWP these days
I am not exactly a camera expert, therefore if you are interested, i suggest that you ask some experienced person to accompany you.