Mine showed up last evening after dark, so I had to wait until this morning to do some comparison shots. These have no artistic merit at all, just trying to show how wide this puppy is. So, I previously had a Pentax DA 10-17mm zoom, which I sold to fund the Rokinon. The Rokinon is about ½ the size of the Pentax, even without the K mount adapter, so it's a much more compact package on the NEX. The Rok is faster, but the Pentax is a zoom. The lens cap on the Pentax is a very nice metal slip-on (very similar to the CV caps), the Rok lens cap also slips on, but it's much deeper and it actually snaps onto the lens hood. The Rok front element protrudes much more than the Pentax front element and the hood is much larger on the Rok (that's a good thing). Even with that it's really easy to get your fingers or your feets in the pic if you so desire. Dioptrick wondered how I got my overhead sky shots with the Pentax without getting my noggin in the pic since i use the 5N with external EVF. With the EVF tilted up all the way and the camera pointed up you can stand normally like you would for a normal shot. In other words- you can shoot straight up and not bend over backwards to do it. I hypothesized at the time that with the Rok I might have to alter my technique. Turns out not to be the case, it works fine. I would have to take my hat off though, which I wouldn't have had to do with the Pentax. Enough werdz, show pics! First the Pentax And the Rok (position not the same on this one, I didn't look at the old pic before I shot this) The Pentax again And the Rok again (got pretty close to the same spot on this one) The Pentax shots were at f/8, the Rok shots at F/2.8. All the Rok shots were focused at infinity. Click stops are well defined, including ½ stops. I should note that the focus ring is very smooth, but very stiff. Not sure yet if that's good or bad, but since the DOF is huge it probably doesn't matter. Ninety percent of the shots I'll take with this lens will be at infinity anyway. Couple more shots just playing around. I'll post up some serious stuff later, when I decide what I'm going to shoot.