Originally posted by Tim_R I recently acquired a K-x with the 18-55mm and the 50-200mm DA-L lenses. So far I am very happy with both lenses. But... I "grew up" in photography in the 1960's with a Contarex and a Leica M3. Back then the common wisdom was that "consumer" priced zoom lenses were just that - for consumers - and could not possibly compare for image quality at any setting with a prime lens of comparable focal length. My personal experience back then confirmed that. For equal dollars spent, primes had it all over zooms.
I suspect, that even with modern technological improvemments in lens design and manufacturing, the same is still true to a greater or lesser degree: a zoom must be a compromise where a prime can be designed to produce better images for the same cost.
It's pretty much still true as a generalization, but a sufficiently good (= expensive) zoom can rival most primes - particularly primes like the DA40 and DA35 that are not any *faster* than said zooms. The kit lenses are not those zooms, though.
For me, sharpness is the primary consideration, though wide apertures are not. Outdoors I usually shoot ISO 400 and close the lens down to its best aperture, which still usually results in high enough shutter speeds so tripods are not required. Good contrast and color rendition are also major considerations. Given a choice, I prefer "warm" color to cool.
I have read the entire lens review database for all lenses from 28mm to 50mm and am currently considering two, both of which look like great lenses:
Quote: Currently, I find the prices above on eBay.
You can generally beat those prices with the major US dealers like B&H and Adorama.
I don't have both, but as much as I love my DA40, I'd say if price is not a stumbling block, that seems the better choice for you. I really like the 40mm FOV, but I need a wider a lens to complement it (currently M28/2.8). A 35mm would make a good compromise if you're looking for just one lens in that range (and don't want to spring for the 31, of course).