One thing I think I should add is that even though something looks good up close and isolated as you have there with the sofas, you always have to think about the "big picture" in terms of readability.
If you were to step back and look at the first one with fresh eyes, you'd get a feeling of dappled light on the living room. In the second one, you'd get a sense of something off, but likely wouldn't know what it is (and it may not really bother you that much, but your brain will tell you *something* is off regardless). It may not look right, but it is indeed correct when looking at it from a big picture view and with fresh eyes.
You might not like it because the cast shadow's coloring on the couch might be too harsh for you, and in my opinion, I think it is for me. I doubt the reason you don't like it is because it looks 'wrong' though (the second image I mean).