T-Mobile Netherlands and True Thailand choose 8 antennas for FDD spectrum, joining Kuwait in choosing Huawei gear. 8 antennas will rarely deliver twice the throughput of four antennas but will often deliver a 50% increase in capacity. 32/64 antenna Massive MIMO has been chosen by BT, DT, & FT but that is in higher frequencies running TDD.
32 antennas for 700 MHz spectrum would be too large to be practical most places. 256 antennas at mmWave frequencies are the size of a large chip and can go almost anywhere. 64 antennas at mid-frequencies like 2500 MHz need 1.5 to 3 meters, practical on most towers. Antenna size goes up with lower frequencies, making 32 antennas at 700 MHz a challenge and often impractical at 1800 MHz.