I was on a big $$ Sonoran mule deer hunt. Outfitter knew I was a 'glass freak' and wanted some objective comparison. Since we were driving in, he said to bring all the good stuff. I brought Swarovski, Zeiss, and Leica. I had them all in 8, 10 power + another Swarovski in 20 power. We're talking about Hours of glassing for 6 straight days. Day one, we placed our bets - me on Swarovski, him on Zeiss. On day 6 there was a clear and unequivocal winner - Leica by a mile. It was a total no brainer. I admit I was surprised!
On our Tanzania hunt all the professional hunters were carrying the little geovids. No Swarovski, no Zeiss. Geo's - period. They laughed at our Swaros!