i own 1500(not 1401), 1200mk2, 1210mk2. apart from VTA adjustment, 12x0mk2 is also heavier 12.5kg vs 9.5kg, has adjustable feet with more damping than 1500. So it is less affected by vibrations from table or floor, which i found is a problem for my 1500.
by reading the spec, i believe your 1401 is superior to 1500 spec wise. 1401's speed is quartz controlled and the spec on wow/flutter is same as 1200mk2. But without VTA adjustment, you have limited cartridge selection, or you have to use multiple slipmats of different thickness, still not accurate.
i am sure 1401 is a great table for the 70 euro you paid. but it depends on how you are satisfied with it and whether the benefits of 1200 versus upgrade cost make sense to you.