Focal Headphones with Linear Tube Audio

Has anyone heard Focal Utopia or Elear headphones with the Linear Tube Audio headphone amplifier? Impressions?
Had some people in with the Utopia today. The MZ2 does a great job with them. 
The LTA Micro ZOTL sounds wonderful with my Oppo PM1 head phones but if I were looking for head phones I would wait a couple of months because David Janszen has new hybrid electrostat head phones set coming out. He had a prototype with him at Axpona that made quite an impact.