Nokia 808 beats iPhone 4S at video, because of its 4x lossless zoom in full HD 1080p and 6x lossless zoom in 720p HD video and much better quality of the audio. The 808 has 2pcs HAAC (High Amplitude Audio Capture) microphones and high quality Texas Instruments TPA6140A2 audio amplifier which supports Dolby Digital sound and distortion free low bass. iPhone 4S can't use lossless zoom because its image sensor is only 8MP (vs Nokia 808 41MP) and it has not any amplifier for recorded audio and the microphones (1 mic is for recording and 1 mic is noise canceling mic) are non-HAAC.
Here is for example recordings of Lady Of Winter by Crimson Glory - first one shot with Nokia 808 and second shot with iPhone 4S. Note! These videos are recorded at the same place and at the same time 11/08/2012.
1. Sample of Nokia 808
2. Sample of iPhone 4S