Hoya does make good filters but even so they offer a range, and some will have more flare than others. See the
often-referenced lenstip review. Routinely using a hood is one of those simple things that will improve the quality of your shots; get in the habit.
You can do bracketed exposures without a tripod (not ideal, but workable). I assume the K-m has the auto-bracket feature; check your owners manual. You can fire off 3 or 5 shots while keeping the camera steady enough to be able to combine the shots in PP.