Oly 14-42 II R or Sigma 19mm for EPL1

I haven't tried the original 14-42, but I have the II version which I use on both the epm1 and the epl1 and it's markedly faster on the former than on the latter. The combination of lack of focus assist light and dim lens does the epl1 no favors. On the other hand, my much brighter panasonic 20mm is almost as fast on the epl1 as it is on the epm1, so I'd go for the brighter Sigma 19mm if focusing performance is your primary concern (it also had generally positive reviews).