Originally posted by kevins New to photography and was looking at buying a 2nd hand smc pentax-m 50mm lense for portraits or would my 18-55 kit lens provide descent results
I don't think there's any comparison that you'll come to love the Pentax-M 50 and the results will be superior to the kit lens, but if you really want to appreciate using primes, and for a comparable price, get yourself a used Super Takumar or Super Multicoated Takumar 50 1.4 ($75 to $100, and less if you get lucky on eBay).
Not only does this lens hold every penny at resale (like the M), it's also superb and will open up the world of manual photography to you.