That is a personal decision as to whether the upgrade is significant. For me the Noble 4 is a substantial upgrade in build and sound quality. For others it may not be. I will say the 272 is a great value for what you get. We all have reasons for why an IEM is good or bad. These reasons do not translate between people. I would say the Noble 4 costs more to manufacture than 272 based on specs and build quality as well as accessories. Each company is not going to release the actual costs though.
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what is its retail price ? i think that below 500$ , the upgrade will not be significant , so until money comes in we stick with 262/272 (which are fine iems)