Optics are extremely individual specific Everyone's eyes perceive optic performance.....literally....through different eyes. If you are going to spend the big dollars, take the time and effort to really personally evaluate the options with your own eyes. Only spend the next increment if you truly can perceive the gain, and feel the gain is worth the cost. Of course, to many of us money is a non-issue replenishable resource, can easily afford whatever our heart desires, and want the image that having the most expensive provides. Your eyes may not perceive the marginal difference in that last $1000-1500 between optics steps. The higher one seeks in technology/performance, including optics, the more expensive each smaller incremental gain becomes and the smaller the perceivable benefit....Law of diminishing Returns.