Actually, based on his original post, I believe all the shutter speeds were more than adequate as they were done on a tripod.
<- typed before above reply :x
You're just going to have to practice to get good results with manual focus. I agree with m42man that the focusing indicator (green hexagon, not red indicators) aren't useful, at least to a degree. They have a bit too much range, especially at f2.5. However, in my experience with manual shooting I notice if I "over focus" towards infinity and then return I'll have better results. Going the opposite way usually results in missed focus.
Of course you can get a hood for the K 135mm. The original may be available sometimes, and, of course, there is everything from rubber hoods to diy paper ones. Me, I prefer to use empty filter rings (4 I believe) and a 58mm to 49mm step down ring. This then gets me down to a 49mm lens cap.