That's not necessarily the case, however LTE on 1900mhz is fickle about permiating indoors.
To answer the OP question each technology (4G/3G/CDMA) is separately remotely adjustable on each of Sprints sector antennas; thus coverage radius may vary accordingly. Also if your standing at the bottom of the site running a speed test you may as well be kicking tires, most sweetspots are 1/4-1/2 mile away from the sector (for testing.)