I know it won't be a popular opinion on this forum, but all initial reports/results say it is better (at least on the track, where .... matters).
The R1 is just as narrow and just as light, and makes about the same power. Because of the crossplane motor, it has the mechanical grip advantage with the power deliver (like a Twin or V4), but it revs faster than a V-Twin.
It has the same electronics as the 1299, but better because Yamaha utilized the higher spec 6-Axis IMU rather than the 3-Axis IMU Ducati used.
And the Yamaha is simply easier to go faster on. I have more than one friend who has went out and set a personal best in their first weekend on the new R1 (which is impressive because I am talking about guys who have been winning races for years, not some reporter).
It has all the advantages the Duc has with the light weight, great power, smooth power delivery etc...but it is simply easier to ride...which equates to faster lap times.
There is a reason why the grids are full of R1's at the Club and Professional levels all over the US.