You dont use your FA 1.4? Do you feel the A 50 f2 is better IQ wise? Cause I have one of them too! Lol, I went on a spending spree in the last month and am still on it.
I forgot to put in all the filters I've picked up as well, but I rarely use them. I would really like to get some ND filters and see what they can do. I've been so caught up trying everything that the DSLR is capable of I haven't slowed down to focus on any one thing.
I truly enjoy the manual fixed lenses, it just seems more like it was back in the day when I'd shoot a roll and I'd be lucky to get one photo worthy of the photo album!
I've had the Kx since late January and have over 6000 shutter releases so far. I hope Pentax is good about their warranties cause I don't think I'll be slowing down anytime soon especially with the nicer weather getting up here now!