A bit of drag is normal on any bike, especially when the engine is cold. I don't recall the 899 to be worse than other bikes, but to be honest I almost never move a bike in gear with the engine off.
The first thing I would check is whether the previous owner kept the clutch lever very close to the grip (small hands), as that would limit its travel. Second, I would do a proper test, with the bike on a level surface and the engine fully warmed up: fully pull the clutch, put the bike in first gear and release the brakes: does it try to move forward? If not, I'd say you're ok. If it does, start by doing a clutch bleed, just to make sure there is no air in the system.
The first thing I would check is whether the previous owner kept the clutch lever very close to the grip (small hands), as that would limit its travel. Second, I would do a proper test, with the bike on a level surface and the engine fully warmed up: fully pull the clutch, put the bike in first gear and release the brakes: does it try to move forward? If not, I'd say you're ok. If it does, start by doing a clutch bleed, just to make sure there is no air in the system.