Questions regarding OIS

[Sym3]

What method of OIS is used in 1520? Spring loaded as in 920 or ball bearing which is used in 1020?
Can the OIS be displaced if the device is shaken slightly/vigorously or dropped?

Cnet review states that the Lumia 1520 has ball bearing for OIS. Is this true? (third line of the review)
Nokia Lumia 1520 Review - Watch CNET's Video Review - page 2

 

[rajamass]

Its ball bearing lika in 1020 which is more advanced than in 920
I dont think displacing or shaking phone will disrupt the bearings

may be huge drop ?