New Canon 650D Video ISO test and review published by Channel5D, the canon 650D High ISO noise performance during video mode look bit inferior when compared to 7D.
Snapshot taken form Noise test, the 650D have more noise at ISO 6400 compared to 7D, the 7D have approx 3 year 18 Mp sensor with Dual DIGIC 4 processor whereas Canon 650D have newly designed 18 Mp sensor to support Hybrid AF system and single core DIGIC V image processor.
Snapshot taken from 650D video review (below),
Canon 650D Video review
High ISO noise Test
See more details and a 650D review on cinema5D: at www.c5d.at/650