The 1080p, 1440p, and 4K screens in the Tx40 series and newer (T440, T/W540, etc) are fine screens.
Don't forget the battery life also didn't get 'good' until Haswell chipset laptops came to be, which is also the x40 series for Lenovo. Before that, if you want any kind of battery life you need the extended battery that sticks way out, or the sheet battery which makes a not-so-thin laptop even thicker. Also, finding a battery that's in good shape for a 6+ year old laptop can be pretty tough.
Just replaced the motherboard of my T420s. While waiting for the part to arrive I used a much newer laptop, which only made me appreciate just how great that beautiful old 7-row keyboard is. I suppose I'll have to give it up one day, but not yet.