I think if you want to show off the nice wood grain and inlay of the table, go light color on the sofa, even cream like the drapes, or neutral like the carpet, or a shade darker. Then you can add whatever accents you like in pillow colors, accessories which can easily change seasonally or with time and little cost. The sofa(s) are so big that you might not want them making the most design statement in the room, but just providing comfy seating and a big amount of soothing neutral color. It helps to look at your room like its a landscape painting, foreground, midground, background. Sofas would be midground and you don't want them too bright or busy to overpower the other planes in the roomscape. The colors you have now work, but I would go solid with a textured fabric, something soft like a chenille.

HI -- From the brand of your dining set sounds like your modern ,right? Go with a neutral grey in a dark to medium tone . Need more info otherwise !

Go with the leather that is a shade lighter that the floors. Otherwise it could get lost in blur of grey. Use accent colors in the lamp shades,wall art and throws. I also like the white table better. The metal table is more industrial. Than the style you are going for.

Beautiful art wall and table! I'd suggest a medium honey-colored stain. Given the likely heavy usage, the table top is one of the few places I'd suggest a polyurethane finish. Legs can be finished with e.g. tung oil as it is very easy to use and should be OK in the lower use area.