I love my nikon optics. I have 2 buckmasters and a protaff. All of them with BDC (bullet drop compesator). They are uber clear, waterproof and shockproof. I have used them at 20 below without frosting up. I have never had a leapold so I can not give you the other side of the spectrum but I will say, you will not be dissapointed with Nikon optics.
Lucky Taurus Owner... 3 out of 3! PT1911/ PT92F/ 44 Raging Bull