Still with this? Yikes. Glass is optical. There's no hard ceiling in relation to resolving up to some mythical pixel count. A higher resolution sensor will simply allow more detail passed through the glass to be captured, and the comparable results will be relative to what lenses you use. An 18-55 kit lens (pretending it would fill a FF image circle for a moment here) will yield a better result with 50MP capturing it vs 18MP. The same can be said, relatively speaking, of the 24-70 f2.8 L II. Obviously the L will blow the $100 kit lens out the water by light years, BUT both lenses would see improved resolve thanks to a denser sensor with better pixels. Will every lens yield the full 50MP? No. No lens can perfectly resolve all light because as a matter of physics, there is some relative degree of loss as light passes through the elements of glass. However, we've come to a point where great lenses now have been engineered so darn well that the loss is almost unnoticeable to the naked eye, particularly when compared to lens technology of just a few decades ago. As an example, just pull up some DxO scores on Nikon and Sony lenses and look at how close/far the resolve to 36MP on a D810 or A7R. None of them get to 36. There are few who get you into the 30s, but they are $5000 Zeiss primes. Some of Canon's sharpest glass is currently resolving near 20MP on a 5DIII, whose sensor is only 22MP. That's a 90% resolve. That's about as damn good as it gets. So take that same 90% figure and apply it to a 50MP sensor, and I bet we see 40-45MP scores from some L glass on a 5DSR (think 135L 24-70 L II, 70-200 L II, 300 L, etc....)
