i have an E470 sitting next to a X1 Carbon 5th gen, and I can tell you you are very wrong. The plastic is a different texture, but they otherwise feel nearly identical. The only key I can feel a big difference in the tension on, is the spacebar. The layouts are identical.
Everyone shits on the E series, but since they got rid of the CD Drive and put the old trackpad back, they have been nice cheap pcs.
good to know they went back on the crap they were doing with the E series. I badmouth it because when i saw them in person (bought online, returned) they deserved it so badly that i didn't even consider another lenovo afterwards