According to CCRL [1], Komodo 6 and Stockfish 4 are 20-25 Elo weaker than Houdini 3 (in the last few years Rybka wasn't able to compete with Houdini, in TCEC it wasn't even able to qualify into Stage 4). However TCEC uses development versions of Komodo and Stockfish that are much stronger than their latest stable releases.

[1] http://www.computerchess.org.uk/ccrl/4040/

It's hard to say precisely because top players don't really play top computers competitively, but the best computer engines appear to be well above 3000 by now. The estimates on the TCEC page put Stockfish and Komodo both at around 3100.