The best replacement for t420 is t420s.

The best alternatives to t420 are rated as following:
★★★★★  t420s
★★★★★  t430
★★★★★  t520
★★★★  x220
★★★  t410
★★★  t420i
★★★  w520
★★  t430 thinkpad
★★  t510
★★  t61
★★  w510
★  t530
★  t620
★  l420
★  t400
  e6420
  e420
  x230

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