Best used ThinkPad to buy in 2020?

Spoiler: not T440p

GitHub: https://github.com/notthebee
Twitter:   / notthebeeee  
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Sources in order of appearance:

CES 2018: Intel showcases Kaby Lake R laptops by PCWorld
   • CES 2018: Intel showcases Kaby Lake R...  

Intel Core i7 7500U & GeForce GTX 940MX Cinebench R15 test by TR 37
   • Intel Core i7 7500U & GeForce GTX 940...  

Lenovo ThinkPad X1 Carbon, T480 and T480s: Which to Buy? by MobileTechReview
   • Lenovo ThinkPad X1 Carbon, T480 and T...  

$999 Lenovo ThinkPad T490 and the thinner T490S by Charbax
   • $999 Lenovo ThinkPad T490 and the thi...  

Lenovo ThinkPad T480 Unboxing Quick Teardown by IT FIX
   • Lenovo ThinkPad T480 Unboxing Quick T...  

Benchmarks, tech specs, weight, battery life
https://notebookcheck.com

eGPU w grach - czy warto? Testy w Metro Exodus, Battlefield V, Wiedźmin 3, GTA V
   • eGPU w grach - czy warto? Testy w Met...  

A FrankenPad Story: T25 with Quad-Core CPU and UHD LCD Panel
https://kitsunyan.github.io/blog/fran...

Music:
Abloom - Blue Light