Those R50s were mostrosities!
They are very fat, especially in comparison to the T420i of my mother.
It's amazing how shorter and wider the L520 is for almost the same screen diagonal. That's 4:3 vs 16:9 for you.
Thats right, and the L520 is a bit lighter than the R50e. 16:9 vs. 4:3: I prefer the screen of my L520 because it 1600x900 (quite good) as the resolution, while the R50e has 1024x768 (terrible). Before I bought my L520, I used a R60 with the same pathetic resolution, so the L520 was a great step forward for me.