Jaeger, I did a quick search and found this tidbit:
From what Imhave learned, the oil consumption problem was caused by the use of some German made low friction piston rings that would not properly seat thereby allowing for oil blow by and the resultant consumption. Hyundai was only one of several manufactures that used these defective rings.
It appears that Hyundai figured this out and any vehicles with build dates after Feb. or March of 2012, possibly earlier, have good rings in them with no consumption problems.
So, if you have the VIN you can figure out the build date.
By the way, my uninformed take is that the Lexus is the showcase for a brand whose mission it is to build the highest quality cars possible. As such it is impeccably built and will go the long haul.
The Hyundai is good car that was built to be a cheaper 5 series and just happens to have a strong motor. As such corners were cut to meet a price point and it will nickel and dime you as it ages.