Late 2012 RX's got the features your IS350 has plus a few more.
Sounds like you missed out on getting Bluetooth streaming, hard drive sat nat that is quicker/better than DVD nav, Digital Radio, Live traffic alert in Nav plus a few other upgrades by a couple months.
The late 2012 RX was more than just a facelift. There was a good upgrade in features/tech & a price decrease.