Summary: Best binoculars I have used. I bought Leica instead of the Swaro's because the guide I use said that the Leica's held focus better than the Swaro's if dropped or jarred. I used them on a deer hunt in October 2012. They were bright and clear even in low light situations. I could look under bushes and in shadows and see what was there or not there. Glad I bought them, I should have bought them years ago...
Summary: Side by side view of these with Zeiss and Sawarski were pretty even, but the compact size and sturdy feel of the Leica put them over the top. These are the best of their class. Which would mean the best on the planet.
Summary: I bought these Leica Ultravid HD's (7x42) and a pair of Swarovski SLC New HD binocs (8x42) to review side by side with each other with the intention of sending one back. Very tough choice. Bottom line is that they are both top notch binocs and you can't go wrong with either one. Excellent clarity, very precise, tough, good focus nobs, etc. I settled on the Leica for a couple reasons.
Summary: I have used my Leica Ultravid HD's for two hunting seasons now and they are excellent binocs. These replaced a pair of Leica 7x35's I had received as a tip about 25 years ago. Those optics spoiled me for sure and I hope these last as long. The low light performance and clarity of these optics are amazing. You don't just see a yellow "something" a mile away, you see an elk and can almost make out horns if he's big enough! I have two complaints.
Summary: I have tried all of the premium European binoculars and in my humble opinion, Leica Ultravid HD are the best. Their contrast and brightness are amazing! I was setting on my deck, just minutes before dark, looking through the Ultravid HDs at the countryside and picked up a herd of deer about 2 miles away. I could count all of the deer and tell which ones were feeding and which ones had their head up. These binoculars (10X42) are very light, compact and tough.