I am not too bothered about isolation, so I'll add the Sonys to my list as well.
Reading the reviews of the JVC HX850s on Amazon - they do sound promising!
I own a pair of JVC FX700s and they are absolutely friggin wonderful. They are the most expensive IEMs I've heard so I don't really know how they compare with their peers, but they sound great to me. I want to address the recessed mids comment. Its hard to describe but I think recessed mids is not a good way of putting it. Its more like enhanced deep base and high freqs. Nothing is lacking. The mids on these are lush and warm and fully present. They are just an absolute blast to listen to. I often find myself thinking "I should go listen to my JVCs" rather than go listen to music. I have 4 pairs of headphones, etymotic hf2, beyerdynamic dt880, atrio M8 and the JVCs. I also owned sennheiser HD600 and Grado 60 and 80 in the past. The JVCs are the ones I enjoy the most. There is something really charming about their sound. The beyerdynamic are probably the most accurate of the bunch but the JVCs are just more fun. I wouldn't be put off by the v shape sound structure. Its different but like I said, you are not left wanting for anything.