Raw files that show no contrast issue at all of the lens. It's possible that lightroom applies some sharpening here and there during the export or that some sort of preset applies on the photos as soon as imported, but the real contrast of the image should be preserved. this makes me feel a little better.
I am going to shoot another roll, again comparing the Canon 24mm and the Biotar and I will keep you updated.
I sincerly wanna thank all of you that the followed this thread so far, I appreciate that.