My son bought one for his apartment and I really like it. There are so many colors that work with . I handed off some navy pillows and a throw I was no longer using

This looks so chic!

I would do both sofas in the cognac, then introduce fabric upholstered chairs and/or ottoman

I think you could do it, but I do think two colors in leather always looks like one is the outlier, like you had an existing sofa and couldn't find a match.

I did find this pic that I think looks good, but they really limited the other colors in the room:

vs matching:

I think this looks ok, but not as good as either of the above.

I see what you are saying. I like the top one the best in theory..lol.. don’t think I can be disciplined about choosing minimum colors through. So 2nd one is probably a better option

My daughter in law is in the process of furnishing their new home and has purchased a cognac leather couch and 2 beige fabric armchairs, so far. Looks great!

Or, dark and moody