I can’t even bear to look at a low DPI screen for more than a few minutes. Anything under 150dpi just looks so awful to me at this point. Basically ruins all older laptops from my perspective.
I have an old Dell workstation laptop and 15” MBP both manufactured around 2008, with 1920x1200 and 1440x900 panels respectively and they’re both much nicer to use than what you find in a lot of T-series Thinkpads, so it’s not even an age thing… Lenovo just used bargain basement panels.
On the older models you can also do a mod to sacrifice your DP port for use internally with an eDP panel. There's one for the X220 to do that. Although if you're okay with 1366x768, the X220 Tablet models all have IPS panels from the factory and don't look too bad.
The X220/X230 mod uses the docking port's DisplayPort lanes, instead of the DisplayPort port. I'm still able to use the DisplayPort port on the X220.
The T420/T430 converter doesn't use DisplayPort, but simply converts LVDS to eDP.
I used the B140HAN01.3 (AUO panel) for my T420, which my friend also got for a T440p. Colors and viewing angles are great on it, likely the Razer Blade panel you mentioned.
The X220 mod was a pain to install IMO - soldering to tiny solder points on the motherboard, soldering the sense wire which needed burning off the enamel from the enameled wire, and having to cut out (I used flush cutters) parts of the top case for the new display to fit. My first install wasn't great either, with a cold joint causing issues I solved later on by reflowing the joints.
The AUO 14" panel has better color gamut (IIRC 100% sRGB coverage) than the available 12.5" panels for the mod.
It still looks good & comfortable to my eyes ; however all kinds of software just become unusable at that resolution.
Which is quite disapponting.
It's an awesome machine but it might as well be a desktop because it's so bulky and heavy that I never take it anywhere.
I travel with my M2 Mac but that Thinkpad sure is a sleeper.