I received an E50 for another room and took the opportunity to test both side by side, with same cables, power, sources. Yes, I hear a difference, but very subtle, far from the way it has been put. I would say that the E30-II produces a flatter signal, but both have great musicality and the same performance, as expected. I also have an iFi DAC with a hybrid multibit chip and the difference is more noticeable. It doesn’t measure very well, but both E30-II and E50 may sound overly revealing to some people when compared to that one.
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EDIT: This site is at the top in searches and my goal was to help common people not to make a mistake by comparisons of the same products, without reference to a third one. The others do better by ignoring this.