Looks like I have an annoying dust bunny and the lens cannot be removed so no chance of easily doing it myself like with a DSLR! I'm hoping this will get fixed under warranty. f/16 - very annoying! 
f/11 - still v bad 
f/8 - not good 
f/5.6 - blurry now 
f/4 - quite blurred 
f/2.8 - very blurred but still visible 
update 9/1/14: just noticed that the "dust bunny" has shifted a bit! I'm hoping this is a sign that it's not "welded" to the sensor and might drop off. I normally keep my GR in the pannier on my bicycle, so I'm hoping that the constant vibration might eventually shift the dust altogether. I have put the camera loose in one of the pannier pockets so more vibration is transferred to the camera and with the front face (lens side) down as well. 
Search
Ricoh GR sensor dust
date: mon 6 jan 14