Cisco provides GUI-based non-disruptive rolling upgrades of the HX Data Platform as well as the UCS server firmware.
HX 3.5 adds a 1-click upgrade of ESXi along with HX Data Platform (HXDP) and server firmware. This is a true "one button" workflow approach.
Whats especially noteworthy is the fact that no vMotions are required while executing the software upgrade, which differentiates Cisco HyperFlex from all other platforms.