Yes, the iMac 5K 27” produced in 2020 remains an excellent purchase even in 2023, especially with a discount. A 5K screen of the same standard as Studio Display is provided together with upgradable RAM and SSD options, as well as enough CPU and graphics power for 4k video editing tasks. It’s a reasonable solution for a lot of users—up to 128Gb RAM can be installed and external SSD’s can be used for additional storage. Just keep in mind that in a couple of years one should consider using OpenCore or similar tools to install more up to date versions of macOS.