Originally posted by Bui I prefer the sharpness and color from the 18-135
If you prefer 18-135 over DA40 which is a very good prime, that is the whole reason to keep using it. If I were you, I wouldn’t invest in a prime anywhere between 18 to 135 mm. What about invest on a DA15 or 200* / 300* etc.
However, I look at your images without seeing the lens used at first and I ended up like image taken by DA40 more. Anyway, if you like 18-135, it is nothing wrong to stick with it. And pay for a prime in a focal length you not yet have one.
Originally posted by Bui night shot
I see a few good handheld night shot taken by a DA21 somewhere on this forum but I don’t have one yet. I am thinking about get a 21 or 20-40 pretty soon.
Originally posted by Bui fast enough, sharp enough, light enough and cheap enough
If you think 35mm is wide enough, you might want to look into FA35 f2 as well. It is sharp at f2, even sharper at f2.2, bleeding sharp at f4. A secondhand is cheap (at less in Japan) and light + I think it is the fastest Pentax 35 mm still in production. I used to have one and it is a real deal. F28 is another good fast and sharp lens.