The desktop environment KDE Plasma 5.27 was thoroughly examined by Dedoimedo.

Plasma 5.27 - Can't say there are many differences, but 'tis ok

Detailed review of Plasma 5.27 desktop environment, tested twice, in a live session and installed vanilla KDE neon User Edition distribution, including look and feel, customization, HD scaling, Discover behavior, Welcome Center, online accounts, performance, responsiveness, various bugs and inconsistencies, and more

Plasma 5.27 - Can't say there are many differences, but 'tis ok