I took my new pinholga mentioned earlier out for a spin today. Didn't measure the pinhole but guessed it would be around f/170, and the negs look good. Could probably be closer to 200-220, but hey.. HP5+ in Rodinal 1+100 for 45 minutes gives you quite a lot of wiggle room when it comes to exposure. I did bracket a scene at the beginning at f/100, f/170 and f/250 and they all look good. The f/100 one is a bit thin.
Can't say much before they are printed, but they look as sharp as a holga lens..