I do not shoot in 4K. My current experience is that 2.7K is a great balance since I can do some re framing and horizon leveling and export to 1080P without any loss of quality. 4K files are huge. with 2.7K I rarely hit the 4gb wall. That being said, I currently have Power Director 13 and 14 on my machine and I sparked up PD 13 and put a Dlog 2.7 clip on the time line. With the Preview quality set on Full HD Preview resolution,(the little box between the frame grab camera and speaker icon near the shuttle controls) I only detect some slight noise. in the preview window. However, if I selected "High Preview" it looked bad. This control only affects the preview quality, the render quality is unaffected by this control.