[RioRico]

The FA 50/1.4 is an awesome lens and still my favourite! (haven't used the DA 21 long enough yet to figure it if it's better for me) I picked it up for like $300 USD about 5 years ago and it has served me well - especially useful in low-light, and for head & shoulder portraits.

I got my FA50/1.4 for US$200 for my original K20D kit almost 4 years ago. It's my gotta-get-the-shot lens, and still my only AF prime. Wide-open for low-light, action, DOF control -- and stopped-down for great sharpness and rendition.

Just in terms of focal length on an APS-C frame, I like and use 50-55-58mm much more than 35-40-45mm. My favorite prime focal lengths (in order of use) are 50-28-21-100-16mm. But my most-used focal range is probably within 28-80mm. Sometimes faster is better. Sometimes slower is sharper, and with character.

ObTopic: I'll still recommend the 21Ltd over the 15Ltd for general-purpose usage.

[abacus07]

I only have the DA15 and a K24/2.8 but I'll agree that there is a huge difference between the two focal lengths (even more for me). the K24 is more useful as a general use lens especially for taking photos of landscapes/scenes. But the DA15 really was stunning in forests where you don't have a lot of room and you want to photograph more than a couple of trees. Or pretty much anytime you have great foreground. I'm not completely sold on the 21mm focal length for myself. When I want to go wider than 24 or 28mm I find that I want to go a lot wider. However I think the DA21 is a good choice for the OP based on what he wants.

An example with the DA15