To compare specifications you should use this site:
Notice the red stars. They indicate what owners think of their cameras.
There is a link under the red stars which takes you to a place you can see what owners have to say.
All of the cameras you mentioned are just average in low light.
I want opinion about which digital camera is better out of the following for great photos,HD quality video and low light photos.
2)Panasonic DMC-ZR3 or ZR1
I have sony Bloggie MHS-CM5(Violet with 5x optical zoom).
Will any one of the above panasonic cameras be alternative to MHS=CM5 in terms of HD video quality?