It is not like SFO at all. The weather, the food, the culture, the beaches (you can swim without freezing it), the mountains and the history makes Barcelona a really different city. No offense to SFOers.
I have to concur on the weather part. San Francisco in summer is like Barcelona in the worst day of winter. Please do not equate sunshine and nice weather. No offense to SFOers, your city is lovely nonetheless.