The Canon Legria HF G10 has one of the smaller optical zooms (only 10 times zoom factor) amongst camcorders of this age. The optical zooms of comparable spec video cameras that were launched around the same time as this video camera range from 10x to 78x, and the average optical zoom is 30x.
We compared all the other 10x (optical) video cameras to this camcorder and we think the Canon Legria HF M52 which has better reviews is also worth considering.
If you would prefer a bigger optical zoom then you might want to consider the Legria HF G30 (20x and higher rated), or the 800 (£1,100) (35x and higher rated) both from Canon.
What does "optical zoom" mean?