New iPad (iOS 9.1) was 3.6 seconds ahead. I disabled automatic synchronization, set the clock manually and then turned synchronization back on. Everything looks fine now, with only +/- 0.044 seconds error.

Too bad i don't know if turning it off and on again would have worked too.

Laptop (OSX 10.10) is 'exact'

Old iPhone 4 (iOS 7) is 0.2 seconds behind, +/- 0.18 second error - 'good'.

New iPad (iOS 9) is 2.1 seconds ahead, +/- 0.08 second error - 'bad' (through 3x reloads, same amount each reload).

Seems to be an issue...

Thanks. I feel like this issue is strangely underreported.