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Compare Lenovo ThinkPad T420 vs. Lenovo ThinkPad X1 Carbon (2nd Generation)

This is a side-by-side comparison of the specs of the ThinkPad T420 vs. the ThinkPad X1 Carbon (2nd Generation). Differences are highlighted in yellow.
Item ThinkPad T420 ThinkPad X1 Carbon (2nd Generation)
Item image Item image
Screen size 14" [x] 14" [x]
Maximum RAM 16GB [x] 8GB [x]
CPU i3-2310M [x] / i5-2410M [x] / i5-2450M [x] / i7-2620M [x] / i5-2520M [x] / i5-2540M [x] / i7-2640M [x] i5-4200U [x] / i5-4210U [x] / i5-4300U [x] / i7-4600U [x]
Release year 2011 [x] 2014 [x]
Screen brightness 250nt [x] (HD+ option) / 200nt [x] (HD option) 270nt [x] (WQHD IPS touch option) / 250nt [x] (HD+ option) / 300nt [x] (WQHD IPS option)
Battery capacity 57Wh [x] / 94Wh [x] 45Wh [x]
Weight 2.11kg [x] 1.34kg [x]
Power interface Coax barrel [x] Slim-tip (square plug) [x]
Graphics Intel HD Graphics 3000 [x] Intel HD Graphics 5000 [x] / Intel HD Graphics 4400 [x]
Resolution width 1366px [x] (HD option) / 1600px [x] (HD+ option) 2560px [x] (WQHD IPS touch option) / 1600px [x] (HD+ option) / 2560px [x] (WQHD IPS option)
Resolution height 768px [x] (HD option) / 900px [x] (HD+ option) 1440px [x] (WQHD IPS touch option) / 900px [x] (HD+ option) / 1440px [x] (WQHD IPS option)
RAM interface Dual SODIMM slot [x] Soldered [x]
Screen type TN [x] IPS [x] (WQHD IPS touch option) / TN [x] (HD+ option) / IPS [x] (WQHD IPS option)
Colour Black [x] Black [x]
Storage format 2.5" 7mm SATA [x] M.2 [x]
Key travel 2.5mm [x]
PWM detected? Unknown [x]
Screen finish Matte [x] Matte [x] (WQHD IPS option)
Width 34.05cm [x] 33.1cm [x]
Depth 23.3cm [x] 22.6cm [x]
RAM 4GB [x] / 8GB [x]
Height 3.05cm [x] 1.81cm [x]
Trackpoint buttons Yes [x] No [x]
Multitouch screen? Yes [x] (WQHD IPS touch option)
Fingerprint reader? Optional [x] Yes [x]
Backlit? No [x] Yes [x]
ThinkLight? Yes [x]
Supports Coreboot? Yes [x] No [x]
Removable battery? Yes [x] No [x]
Card reader? SD [x] No [x]
CPU architecture Sandy Bridge [x] Haswell [x]
Function row style Physical keys [x] Adaptive touchbar [x]
NFC? No [x] No [x]
Keyboard style 7 row [x] Chiclet (Island keys) [x]
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