Sure. I thought the Z5 weren't bad, but they really aren't even close to the Legend R or even remotely in the same tier, IMO. They were bassy to a fault and poorly executed. I like bass, but the Z5 were over the top and almost headache-inducing. The Legend R are a slightly warmer take on neutral, and have clean, punchy bass and can really thump when the song calls for it, but doesn't insert a ton of low-end into songs that don't call for it. The Legend provide an accurate reproduction of the track as opposed to making every song a club-thumping banger. The Z5 was also very heavy on the midbass, while the Legend is more linear and sub-bass notes are well executed and represented and can really rumble. Treble was surprisingly great on the Z5 with accurate timbre and tone, but the Legend R has better treble extension. They both provide some of the best treble timbre I've heard produced by balanced armature, but the Legend is still better here. Besides the bass, my other main problem with the Z5 was the fact that there was audible levels of distortion at medium-high volume levels which were most obvious in the mids. Oh, and Z5 can't touch the Legend in terms of detail retrieval. The Sony seemed to gloss over details heavily in every area except the treble, while the EarWerkz is beautifully detailed. It really is the best of both worlds: an IEM you can get lost in the music with, but also one that you can do a fair amount of analytical listening with.
Again, I don't think the Z5 were bad, but for the price Sony is asking I think the JVC woody series (FX750 and FX850, etc.) are a much better take on a similar sound at a lower price point. However, the Legend are in another class entirely.