Blizzard’s latest Public Test realm update for Overwatch reveals that the developer is trying out some big changes to Lucio and is addressing draws in Competitive Play.
According to the team, Lucio “has often felt like a must-pick due to his raw healing output and the versatility of providing a speed bonus to your entire team.” As a result, Song’s area-of-effect radius has been decreased to 10 meters from 30. Here’s what Blizzard’s testing out alongside an explanation:

Sonic Amplifier

Projectile speed increased from 40 to 50
Alternate fire now considers vertical orientation when knocking targets back

Crossfade

Song’s area-of-effect radius decreased from 30 meters to 10 meters

A temporary in-game visual has been added to illustrate this radius (it is only visible to Lúcio and his teammates)
Heal Song

Healing-per-second has been increased by 50% (also applies to Lúcio’s Amp It Up ability)

Sound Barrier

Radius decreased from 30 meters to 20 meters

Wall Ride

Movement speed increased by 30% when wall riding
Lúcio now receives a burst of speed when leaping off a wall

The goal of these changes is to keep those elements feeling strong, but making them harder to apply to everyone on your team at all times. The end result is that he should feel stronger with teams that he can stay close to but not as strong when on teams with heroes that are often spread out (such as Pharah, Widow, Genji, etc). Much of Lucio?s ...