I think removable covers are more Ikeaish. With real sofas, you choose the fabric and wait several weeks for delivery.
Not really. I have a "real sofa" that's not from Ikea and looks nothing like Ikea or is the same quality for which I paid a lot of real money for it. It does have removable slip covers which is just fine because the couch is beige.

I brought the couch fabric to make chair covering for my dining chairs and the combination of the couch matching the dining chairs looks good.

I bought the sofa from a small design store in Wiesbaden.