There's no need to overdo it with physically based lighting. It doesn't mean you need to model light fixtures exactly as in real world. It may actually often make rendertimes skyrocket. So just placing regular spherical CoronaLights is often enough. What you did with CoronaLightMTL was quite good choice for this scene.
Renders look good, but i think that seat cushion texture is the weakest part. It looks quite lowres, lacks some randomness (deformations, scratching, stains) or something that would break up texture tiling at least little bit, and there are obvious UV seams on the top. :)
So far it looks quite photorealistic. It's just missing some glares around light sources. You can never photograph such bright light without getting any kind of glare. Like on this picture: