In case you've forgotten, the Sony Xperia Z has a 5 inch FHD screen with a 443ppi pixel density. A quad-core 1.5GHz Qualcomm Snapdragon S4 Pro APQ8064 processor is under the hood while the Adreno 320 GPU takes care of the graphics. 2GB of RAM is on board while the 16GB of native storage can be expanded by 32GB using the microSD slot. The back and front facing cameras weigh in at 13.1MP and 2.2MP respectively and a 2330mAh battery keeps the lights on. Android 4.1 is installed out of the box.
If T-Mobile does decide to go ahead with the Sony Xperia Z, it will probably sell the phone for $99 down with 24 monthly installments of $20 due. This appears to be the carrier's pricing structure for its top-shelf models.