Nothing against Edmonton, but I got the opportunity to go up there for a concert recently and the downtown still seems quite underwhelming although their arena is a beauty. Its definitely lacking density. Apparently their Holt Renfrew is shutting down next year along with rumours of Hudson's bay closing down as well which has some concerned about the future of downtown shopping at City centre/Manulife place. Sticking fancy tall buildings is great and all for post cards but your core area needs some substance too. It'll definitely take a few decades for Edmonton to catch up in terms of Calgarys density of buildings, population, employment, and retail situated in its core region.
Bigger and fancier skylines don't always mean better, best examples are Vancouver and Montreal downtown which are more booming and bustling even though a quick glance at their skylines would say otherwise to a stranger. With that said, I would still be hella hyped if Calgary was to get a 300m+ tower?.