I'm fine with a progressive tax even at a local even though as noted we already do this with provincial and federal tax. In essence the wealthy help subsidize local services like Calgary Transit, used to help those with less income, or shared use like parks and walkways etc..
However as I mentioned in my previous post, I'd like to see a hybrid tax model that also rewards development that helps fight sprawl. I think a hybrid of market value rate, combined with a frontage based rate is a reasonable way to go. No tax method, will be perfect, but this helps reward those living in smaller inner city units, while keeping the progressive system.