It could be said that Xiaomi's Mi Mix Fold is the best flexible-display device on the 2021 market thus far. However, it debuted as a Chinese-market exclusive. Then again, the tipster Mukul Sharma has uncovered evidence that could point to its first international release soon.
https://www.notebookcheck.net/The-Xiaomi-Mi-Mix-Fold-might-get-a-global-launch-according-to-a-new-leak.535227.0.html