I'll chime in to this zombie thread to say that Ive been using the 5k2k LG 40" 40WP95C for nearly 4 years. 99% productivity.
Pros: 3 columns of workspace at 3840 x 1620 HiDPI on a single screen
Cons: low-ish DPI, low-ish contrast, only 72Hz refresh
They just announced an OLED successor, same exact size and resolution. But obviously contrast should be WAY better, and refresh goes to 165Hz. I'd probably set it to 120Hz.
I'll look to pick up the OLED model later in 2026 when discounts start hitting.
ETA: the new OLED has a tighter curve, 1500R vs 2500R for the existing model I have. Not sure how I'll like that for spreadsheet work.