I received last friday my E-M5.
I tried for few minutes in my living room with artificial light every 4/3 lens I have just to check autofocus.
In 2009 I bought the E-P1 as soon as available: some lenses on E-M5 now focus faster and better, other are almost the same.
E-P1 was stolen two years ago, cannot compare directly now.
7-14 f4:
Speed around a second.
Accurate, for sure the large DOF helps here.
Never tried it on E-P1.
50 F2:
The worst one: being a macro lens it is very slow and sometimes tends to travel a couple of times all the excursion without getting the focus.
On E-P1 it was almost the same.
12-60 SWD:
Precise but slow, 1 second or more to get focus.
A bit faster than E-P1.
14-35 f2 SWD:
The slowest and less precise among my SWD lenses.
Sometimes it doesn't get the focus, as the 50-200 SWD did on E-P1.
I never tried it with old Pen.
50-200 SWD:
A little bit slower than 12-60, a little faster than E-P1.
It seems at least no more 'final jumps' when the system is almost on focus spot as it did with E-P1.
More test needed.
150 f2:
Speed similar to 7-14 or 12-60, accurate without hunting.
Never tried on E-P1.
Pana Leica Summilux 25 f1.4:
Accurate and much faster than E-P1.
E-P1 + m4/3 14-42 was slower that E-M5 + 4/3 Leica 25.
Beside 50 F2 and 14-35, all my 4/3 lenses are accurate on static subject and able to get the focus at first try even in low light.
They aren't fast for sure, but a second or a little more is acceptable for me.
After all, I still remember my Minolta SR-T 101 in the seventies when autofocus was wizardry...
CAF doesn't work.
14-35 SWD confirms its fame of 'focus hunter' also on m4/3.
The Pana Leica 25 f.14 is a sweet surprise.
With the HLD-6 grip is well balanced and for portraits autofocus is fast enough.
Manual focus through EVF is easier than expected, for sure easier with longer lenses than on my E-5 OVF thanks to the O-MD stabilizer and magnifying.
E-M5 dynamic range, 16 Mp and 3200/6400 ISO combined with Zuiko Top Pro lenses are fantastic.
I see more improvement from E-5 to E-M5 than from E-510 to E-3 or E-3 to E-5.
I took about 200 RAWs and I found just a couple of shot with burned high lights, even in conditions I consider challenging for E-5.
The shadows are much better, but I'm comparing E-5 in Lightroom 3 with E-M5 in Lighthroom 4.
Im' pretty sure software makes a huge difference here.
Oly, now you just have two choices...
Give me an Wifi E-5 with O-MD sensor and IBIS and a better CAF or a micro 4/3 Wifi camera in an E-5 body with EVF and sensor phase detect autofocus like Nikon 1 to get usable CAF with FourThirds Top Pro glasses.
Both solutions are acceptable for me: I promise I'll buy also 35-100 f2 and I'll be happy forever
