Need some comparisons on this scope please.

Leupold SX-1 Ventana 20x60x80

I have a Nikon Field scope III 10x20x60 and I love it. I've had many others as well but am looking for something with good glass, bigger objective, in the $400-$600 price range. I take my Nikon everywhere I go so I would only use it for spotting off the atv or pick up.