Just to note, I'm using far view and have fog off. When I got to the nether, I soon noticed two objects of interest. The first one is the first two images (normal and zoom), this is to the southeast (the focus number in F3 works as normal) and while I initially thought this was a nether fortress, but I'm not so sure.
The second one, which is to the west, is definetly a nether fortress, right at the edge of far view.
Anyways, when I went in, there were pretty much just a few tribes of zombie pigmen, but I didn't stay very long (or explore very far) since I ducked out when I saw a ghast spawn.