In Guide to Leica the following four lenses are compared in an in-depth field study with the usual retina-grade images and crops, full series from f/0.95 through f/16.
This comparison is a complement to the bristlecone pine field comparison and Cabin #9 lounge chair comparison.
The subject here is geometrically plane, and thus is an excellent proxy for lens performance when photographing any kind of building, mural or distant landscape scene.
Compared: Noctilux, Summilux, APO-Summicron, Zeiss Planar (M240, Tioga Cabin #9 Chair)
Abandoned House at Ellery Lake
Leica M Typ 240 + Leica 50mm f/2 APO-Summicron-M ASPH
Leica 50mm f/2 APO-Summicron-M ASPH
Leica 50mm f/1.4 Summilux-M ASPH
Leica 50mm f/0.95 Noctilux-M ASPH