They come very close to matching the transparency level of the SE. There are three issues where the SE beats this model. One, the size of the sweetspot. The SE is better but the SII compares very well to it. Two, the color bias. The SE appears neutral to the red/purple color of the SII. It is subtle but it is there in direct comparison. Three is the 3D effect of the porro. I have yet to find a roof that can match it.
Now that may sound like a great deal of difference but in direct comparison it really isn't. The SII gives me very, very close to the same view as the SE in all but those specific areas.