I asked this sub for CC ideas last week and the top request was L-shaped sofas. Here they are! 2 new meshes and a recolour. Details and links in the comments. I
The Sims Mobile Gets Sectional Seating Before The Sims 4! : r/thesims
Rebecca Corner Living Room - The Sims 4 Catalog
18 Pieces of Sensational Sectional Couch CC for The Sims 4! — SNOOTYSIMS