I got a chance to get out yesterday evening and get some clips in 4K. They were all shot at 30 fps and the only correction done was to the color. I used the color function in Premier Pro CC to adjust the color profile of the clips to SLOG2 on most and SLOG3 on a couple others. Most of the shots were at the far end of the clear image zoom.

I'm by no means a professional and I can barely manage my way through Premier Pro. Let me know what you think.

Sony PXW-X70 4K Footage - YouTube

Very nice. I see the same on my AX100 in that at long zoom distant landscape the image is slightly foggy. The lens is best at wide angle and medium tele for sharpness and contrast. The geese look really sharp and good focus even when zooming out. I hope you are pleased with the 4K footage. I correct the colour with the sony levels filter in Vegas pro.