I'll post a set of sample images, and details from those images from my Widelux vs Horizon shoot-out in the technical gallery.
Both cameras were loaded with Tri-X. The day was overcast but bright. Both shots were taken within less than a minute of each other, and the lighting remained even. Exposure was 1/125th @ f/11 handheld. Both rolls were developed in the same batch of Diafine, and scanned at the same settings.
Both cameras have bubble levels, but you can see the Horizon level in the viewfinder. The Widelux image isn't quite level.