TFA Falcon looked great to me. It had been 30 years in story. Even from ANH to ESB the ship had changes. They pay more attention than you think. They made the gloves of the R1 Vader like the ANH suit (his gloves were differently pleated in ESB and ROTJ.) They used the amber lenses (Noticeable in some shots more than others) and the triangle chin vent is smaller like ANH, widows peak is there which was not on any of the other helmets besides ANH one, chest box/belt is pretty spot-on ANH.
I don't think they pay that much detail to the suit. Look at the ROTS suit as compared to ANH. I think they are happy if it's recognizable as Darth Vader. They know the fanatics, like us, will tear it apart but they are only interested in the bottom line profit so they don't care about those details.
Look how different the TFA Falcon Cockpit was and flown as compared to the OT. I'm sure it was just make it as close as possible and that is good enough.
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