Slow LTE Data speeds compared to other devices

Me and my fiance just got the Gold S6 Edge, mine is 64gb and hers is 32gb. On Speedtest app were'd both only getting about 5mb download speeds. On my HTC M8 I used to get about 40-50Mb. And it's not the network, because I ran it alongside my Xpera Z2 Tablet on LTE, and got almost 40Mb. But WiFi is much faster on the S6, I get about 82Mb on the S6, but only about 60 on the Z2. I have also tried enabling advanced calling, but no difference in network speed.

First pic is S6, second is Z2