Just woke up but...
Telemetry for the top 3 in FP1, the rain doesn't allow to say much, but doesn't seem a very different lap from any of them, Verstappen is taking a few corners a little easier. Didn't see FP1 so I'm kind of going off telemetry only.
* T2-3-4 (tamburello) Verstappen seems to take them more aggressively although his braking is less aggressive, particularly his acceleration out of that corner he puts down the pedal much earlier, but is still slower through the corner.
* T5-6 similar story, VER braking a bit too early and corrects his timing mid braking.
* T7 VER is lifting and coasting like SAI, this actually remains true until Rivazza (T17-18, last corners)
* T17-18 VER a lot slower through here, I think he made a mistake or the car was unstable
As far as engine deployment goes, I think even if that Twitter account says Ferrari has the full power available, the drivers aren't using it.
Judging by the slope of the Throttle graph, every driver took it easy in braking, VER even easier.
Really hard to judge due to the rain, but if I were to make a wager: more time left in the RedBull for sure, but Ferrari looks more stable through the track, if the stability is real and setup related and RBR doesn't fix it, Ferrari will run away with an easy 1-2, otherwise it will be a lot closer come quali.