I've had my OASYS, since 2005. I still use it as a controller, since my Kronos is 61 keys. But, I rarely use it for the sounds, as Kronos takes care of that. Let's get this out of the way; you're going to really miss that big screen. I ended up putting my Kronos at an angle to see the screen better.
Kronos 2 comes with some amazing programs, mimicking popular songs, that the other Kronos models did not have, initially. Once you get used to the Kronos, you're going to find that it can load a lot more sounds, thanks to disk streaming. You can output your songs as 24 bit wave files, whereas the OASYS tops at 16 bit. To my ears, those files have a better bottom end with the bass.
Disk management is improved on the Kronos. It reads more drives and file types. No need to SCAN, when plugging in a USB drive.
Aside from 24 bit recording capability, the Kronos sequencer is much better at handling stereo Audio tracks. Resolution is higher than the O, 480 PPQN versus 192 PPQN. The Kronos TEMPO knob goes up to 300 BPM versus 240 BPM.
Kronos Programs and Drum Kits have 8 split/crossfade layers, versus 4 on the O. Also, you will be able to have double Drum Kit programs on the Kronos. You will also have smooth sound transition, when changing programs and combis. There is also a Set List display, which is very handy.
Some other Kronos items include search functions, at most levels. Easy program INITIALIZE. The ability to edit programs from Sequence & Combi modes. A bigger internal hard drive. Also, Kronos comes with 12 gigs of sample ROM/EXs content, versus the factory 1.1 gigs of the OASYS. There is also an extra AA - GG row of program slots.
Tom Marr wrote:Will instruments - strings, brass, guitars, etc. be better than on O?
As far as Korg sounds, they will be same strings, brass, and guitars from OASYS ROM, EXs1, and EXs3 Brass & Woodwinds. But, if you're getting a Kronos 2, there should be some KApro strings in there.
Korg made some new sounds, but you have to get them from the Korg Shop:
Legendary Strings
Funk and Soul Brass
Aside from the K2 KApro sounds, most of the new content is pianos and drums. There are also some new gongs, rolling Timpani, sound FX, plus a few sounds of Mellotron tape style violins and mixed strings. The multi-gigabyte piano sounds take up most of the memory. I unloaded them, so I could have a ton of orchestral sounds instead.
You will have room for a lot of 3rd party content, if you use the disk streaming options.