Not to mention that the incremental efficiency gain is negligible. Incandescent to CFL is a huge efficiency gain, so you can actually pay back the increased cost in electricity usage in a short while. A 60W equivalent CFL might consume ~13W. A similar LED bulb will be around ~9W. That extra 4W is such a marginal improvement that it would take decades to make it back in energy cost. So the only selling point is lifetime, and I've seen no indication that there is a big difference between the two -- both have similar types of failures, usually control electronics or power supply passives due to poor quality manufacturing.