In the pre-multicoating days, pre 1962 or so, lens designers were said to have one of two choices - either a lens that had great resolution or great contrast. The tessars with four elements and triotars and generally the lenses with fewest elements had great contrast and were sharp in the center, but soft at the edges. The six element symmar style lenses were better corrected from edge to edge.
You might try the first Rollei Planars or maybe even an early Hasselblad Planar. I had a 6x9 folder from the thirties that was very sharp but extremely low in contrast. You would probably have to use a lens hood to protect from flare.
Also I have a totally unprovable theory that contrast might not be linear, at least in older lenses, such as my rigid Summicron of 1959 where the highlights seem to have higher contrast than the middle grays do.
James