Granted the shapes are slightly different and so are the tailpipes but there is a definite similarity and not in a bad way. I really like the current Lexus GS. Some may think the back is too boring or conservative. It's nothing flashy but I think it looks great.
I haven't had a chance to read the whole Autoblog post so I may update this post later after I've read it. What I will say is that I like what Hyundai is doing. I have been a big fan of their design and product direction for awhile and it continues to go in the right direction. Competition produces better products and that is Hyundai's goal.