Stevie - I think they are all pretty much the same - the ZX1 looks a bit better than the TZ6 though and a bit cheaper than the TZ7.
Not true
There is a difference between HD and non HD video
There is a difference in censor and ability to shoot low light with PnS
There is a difference between wide angle and non wide angle
There is a difference in price
Those are the differences between H20 - TZ6 - TZ7
You're talking to guys who are going to be drunk, drooling and clutching one and perhaps more than one LB whilst trying to work out how their new camera works - it may be all true but it's pretty much irrelevant.