The manual lenses I have are:
Zeiss 35mm f/2
Zeiss 18mm f/3.5
My newest baby is the Rokinon 85mm f/1.2. It totally kicks the Canon 85mm f/1.2L to the curb in pretty much every respect except A/F, and is devastatingly sharp wide open. I bought it brand new for $800, instead of $2500 for the Canon version!
The Rokinon lens is by far the hardest lens I've ever used, but it's incredible when you nail the focus. I use live view and a tripod for 90% of my urbex photos anyways, so it doesn't matter much.
My next plan is to get an adapter so I can use my old M42 mount Helios 44. Apparently they have some pretty gnarly effects. I've had one sitting on my old Zenit E for years, and didn't give it much thought.
Zeiss lenses aren't as unattainable as people think. I sold my 17-40mm f/4L lens for $700, and then turned around and bought the Zeiss 18mm lens for $900. I later sold my 24-70 F/2.8 for $1000, and used the money to buy the Zeiss 35mm f/2 for $600, and put the extra cash towards the Rokinon 85mm lens. Basically, I updated my kit, by selling 2 lenses and buying 3 way better ones, with only $600 out-of-pocket. (I do a lot of stock photography sales, to fund my gear addiction, haha)