The HC-VXF990 supports a 3840 x 2160 pixels video resolutions which is higher than most video cameras of a comparable type and age to it. Most big total megapixels video cameras that have been on the market for a comparable time to it support a 1280 x 720 pixels video resolutions.
A 3840 x 2160 pixels video resolutions is actually the best supported video resolution amongst all camcorders of a similar age and spec to this video camera.
A 640 x 480 pixels video resolutions is the worst supported video resolution across similar types of camcorder.
What does "video resolutions" mean?