From the angry mob:
Not only does Qualcomm's X12 (MDM9x45) modem support higher downlink and uplink speeds, but it supports the latest LTE-Advanced features like 256 QAM on the Downlink, 64 QAM on the Uplink, 4x4 MIMO, all commercially active on T-Mobile's LTE network. In order to level the playing field between two chipset suppliers, it's unlikely that we will ever see these features activated on CDMA variants, especially considering that for 4x4 MIMO operation the OEM will have to design a device with 4 receive antennas, something that's very difficult to do. So far only Samsung has achieved that in a commercial device.
Even more shocking is that if T-Mobile variant really falls into the Intel batch, there will be no EVS (Enhanced Voice Services), since that's not supported by Intel 7360 modem. EVS is the next generation HD Voice codec used for VoLTE on T-Mobile, SK Telecom, and it's been active for about six months already. It significantly enhances the call quality, and improves the drop call rate on VoLTE.
But more importantly, the real challenge will be the performance delta in less than optimal signal conditions both on LTE and UMTS layers, where Qualcomm has had the lead for a long time.