Depends what sort of law you're looking for. At the low end, high street and regional end of the market, the difference isn't absolutely huge, because there's not room for a huge difference- a solicitor might earn 35k whereas an LE might earn 30k.
The real difference is in opportunity at the mid and top levels- large commercial practices dealing with international matters simply don't look at legal executives, and that's where the real money is in law. If you want to earn over 70k, ILEX will rarely be the way for you.