I looked through 3 pairs side by side (all 12x50), the Razors, UHD Razors, and Swaro EL.
UHD razors are definitely a strong improvement from the Razors optically, with a significant size increase and slight weight increase as the only drawbacks.
The UHDs surprised me with how close the were to the ELs, then it became obvious that the ELs were brighter without a doubt. But when you compare the price tags, Vortex is almost a grand cheaper than the ELs (depending where you look). I like the way Vortex is going optically, just wish they would've done a 15x but i understand that at those prices, most guys would just go with Swaro, Lieca, or Ziess.