I'd like to hear from anyone with first hand experience with the Kowa's.

They seem to be very similar to the Leupold Yosemites. Same FOV (420'), Exit pupil (5 mm), prism material (BaK4), eye relief (20 mm), close focus (16.4'), roughly the same weight and size, etc. I've heard the Yo's have a warmer view compared to the Kowa's which are more natural.

Which is better?

Kowa: http://www.optics4birding.com/kowa-yf-6x30-porro-prism-binoculars.html
Yo's: http://www.optics4birding.com/leupold-bx-1-yosemite-6x30-binoculars-natural.html

Thanks,
Eric