We have the23zero Bundaberg which has the skylights and side windows. There is quite a bit of visibility when everything is opened up. This picture is from the brochure since I haven't taken one of all the windows opened up.
Check out the Darche high view 1600. The side windows are massive and I love them. Most windows are square, these are half moon shaped and go the full length of the tent. Pm me if interested, a good buddy is a dealer
Treeline Outdoors makes great RTT's with 2 skylights (one as seen in this picture), and oversized windows! The covering for the ladder also has a built-in skylight. The Tamarack (2-3 person) and Ponderosa (3-4 person) make a great 4 season tent! They are also now available in the US www.treelineoutdoors.com