Just last month, Beste Product published this video on Youtube showing HD video quality from both iPhone 4 and Nokia N8 side by side. If powerful HD video recording capabilities is something that you're looking for in a smartphone, then you might want to check it out.
Indoor, outdoor, low-light, natural light, flourescent lighting, incandescent, greens, etc.
TP Asks the Crowd:
For technical specs comparison table, head on over to our iPhone 4 vs. Nokia N8 post.