I guess I'm easy to please, but Korean Express is my go-to place for a treat at lunch (my closest option is Venice Cafe--UGH), and the bibimbop is what I order there. It's true there's no egg (though the last time I was there the woman after me asked for one, and it seemed like the folks behind the counter were going to accommodate her), but it's hard to go wrong with a pile of rice, marinated vegetables, bulkogi, and gochujang.
I mean, it's not nearly as good as any bibimbop that you'd get in a real Korean restaurant, but for a fast food joint, it's reasonably fresh and tastes wholesome, you can sit down, it only costs $5-something, and you can get two mandoo for 99 cents.
Would I go there if I didn't work in the SW Loop? No. Would I recommend anyone go out of her way to try it? No. But I would (and do) certainly recommend it to anyone stuck in this area who otherwise faces tasteless pasta at Venice Cafe or and an array of taste-free options in the Sears Tower.