That place is simply awesome! I am still on travel, so I have not had the chance to print anything. However, the 5DSR, when you have proper light like this, is producing stunning detail. I made a 6 image stitch of this scene, producing a +200MP image. If there ever was a motive who could justify that kind of resolution, this is it.
If you have not been to Iceland, you should definitely go. It is easily accessible from both Europe and the US. Go to Reykjavik, rent a car and drive around the island. There is nothing like it anywhere on the planet.