My point being that because there isn't any backwards compatibility between the I1 and I2 - the comparison is actually between the I1 / X5R and the I2 / X5S.
That takes many other factors into the mix, as well as the basic IQ aspects.
It's not a question of upgrading a camera as such, its a question of "do I replace my current bird or not?"
I think you have to purchase the keys to use ProRes and Cinema DNG which is another £1500! so better add those to the bill as well as the big SSD card at £909 each oh and a reader for the PC at £159 wow this inspire 2 is going to cost £8K in no time.
You can transcode h264 to prores also if you like, in post.
On board prores is not converted, it only records straight to prores, a raw compression if you like.
But what kind of raw format does the X5R shoot in, DNG?