Not quite the same.
K7
• 1536 x 1024 (3:2 aspect ratio) at 30 fps
• 1280 x 720 (720p) at 30 fps
• 640 x 480 (VGA) at 30 fps
K-x
• 1280 x 720 (720p) at 24 fps
• 640 x 416 (VGA) at 24 fps
The K7 has a rather strange resolution at the top end (1536 x 1024), but i feel that doesn't affect the quality. In fact, i think both cameras are adequate in terms of taking video, considering the TV and films we've been watching all our life before the Hi-Def revolution was all filmed at 24fps (still is in most cases).
Check out some videos on vimeo and see for yourself.
K7 video samples K-x Video Samples