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Nope, didn't bother with the OLED screen on the X1. My current Carbon X1 (9th gen) has a 1920x1200 IPS screen. The M14 has a 1920x1080 screen, so a little shallower. The difference is only mildly annoying, as I tend to keep the same windows in the two screens - email and word processor (WordPerfect, cos I be Old Skool) on the laptop, web browser and pdf reader on the M14. Switching between the two requires the minimize/maximize shuffle, but it's no great hardship.
I think you'll like it. It's mildly annoying that it's not the same resolution as my laptop, but it is pleasingly slim and light. And, being Lenovo, It Just Works. Which is nice.