Just ran a speed test with the new iPhone 7 Plus on Verizon's network. Almost 150Mbps down. Only got about 60Mbps on my 6S Plus.

T-Mobile - 113.73 down, 30.63 up here. In a big city with full bars.
I'd like to share my blazing AT&T speed test on my 6S (and this is the Unthrottled speed). Anything I'm doing wrong other than being AT&T customer?
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Verizon has a vast network that can handle a huge number of subscribers today and decades to come.until everyone has a phone that can access all those bands thereby clogging them up with activity. then what will that performance be?
I think the 6s supported 2xCA, so only 2 LTE bands and the 7 supports 3xCA.Good to see. I don't think the 6s or prior supported CA. Theoretically, you will be able to download up to 300mb now.
The phone can basically access x LTE frequencies at once and aggregate them into one data connection.