While that was the logic when I purchased the cameras, the reader's question prompted some interesting internal debate. Is the black and white image quality of the Monochrom really superior in a side-by-side shootout? I almost never carry two cameras like this at the same time, so I don't have much real world basis to judge, just my perceptions from using each. So challenged by the question, I decided to take the Leica Q and the Leica Monochrom for a quick shootout today.
A few notes: I've previously tested that the Leica SL and Leica Q deliver very similar image results, so I decided to only bring the Q out for this test. Theoretically there will be minor differences between the SL and Q and Monochrom, but I'm not doing a scientific review, and figured the Q could represent on behalf of Leica's best color sensors. On the topic of science - there is none to be found here folks. I don't shoot paper focusing targets for hours on end or setup precision tools to compare these things. I did this shootout hand held on the streets of Cambridge, England. The framing between the two cameras is not scientifically accurate. I am a real photographer that wants to do realistic comparisons, not science experiments. If you are too anal to accept these minor differences, please find another blogger.
With all that out of the way, let's briefly describe the shooting setup. Since the Leica Q has a fixed lens, there isn't much to discuss there..... but I did use the in-camera frame line selector to display a 50mm crop on the images so that I could match the lens I was using on the Monochrom. For the Leica Monochrom, I shot a 50mm f/2 Summicron lens. I shot both cameras on Auto ISO, Aperture Priority, and in RAW with -1/3 stop exposure compensation. The same aperture was used on both cameras.
When generating the black and white for the Q images, I just moved the desaturation slider in Lightroom to 0. I made no other edits (which is why you can see some dust spots.... ick). Also, be sure to click on any image for a full screen preview.
Example I: Window
This was my first comparison, because it was a scene with some nice detail and contrast. The brick have a lot of tonal variety due to their age, so that made it interesting for a comparison. First, lets look at the color image from the Q, then we'll look at the desaturated Q vs Monochrom.