Apologies for being away from the forum for a while, but I also have a mind to be made up about an Olympus DSLR choice, i'm looking to upgrade from my E-400 to either the E-520 or E-620, I have been weighing up the advantages of both. The E-520 body only is around £150 cheaper (limited budget you see) but the E-620 has more features and 7-point AF (rather than three which I have begun to find quite annoying). I'm hoping that other Oly owners can help me decide which I could go for.
But then again I was considering a new lens, either the 9-18 or 14-54.
So should I go for a new lens or a new body or should I just shut up and carry on with the gear I have now?
The 510 would save you EVEN MORE money. The difference between the 510 and the 520 is insignificant IMO unless you REALLY like using live preview, and even then, most the good lenses cant take advantage of the difference between the two.
So IMO you should be comparing the prices of the 510 to the 620 instead. That might make the decision a lot easier, or a lot harder...
If you want my honest opinion between the two... I'd go for the 510 and Ill tell you why. The 620's images dont really seem any better than the 510s, in fact it looks like there is almost MORE noise. Certainly ISO3200 [which the 510 doesnt have] is completely unusable on the 620 so theres no advantage to having it. To be honest, the 400 produces fine images, but you dont have IS which will help you a lot I feel. So going from 400 to 510 will be a big jump, but from 510 to 620? not so much.
The 620 has the flip out screen, which is a neat feature but ultimately doesnt effect photo quality, so unless you plan on shooting from awkward angles very often, its more of a novelty than anything. It also has a larger viewfinder than the 510, which I feel is important. However the difference seems pretty insignificant. Off the top of my head, I believe the figures are .92x vs .96x, however to put that into perspective, the E3 offers 1.15x and the E-30 offers 1.02x. Also I have still yet to try the 620 in my hands, but it doesnt seem like it would feel very nice. The grip is so much smaller on the 620 than on the 510. It has a very beefy grip and I feel very secure holding my camera with the heavy 12-60 and flash attached, even with one hand. I dont know if you will get that with the 620.
The 620 though has a bit faster continuous shutter speed, which is nice.
It all comes down to specs/$ and although the 620 has many new features and improvements, you really need to dissect them one by one and figure out which ones will you actually use/need, and which ones are just a novelty. If the camera is comfortable to hold, and comes down in price a bit by ~june, I will be strongly considering it myself. However as it stands today, I recommend going for the 510, or reaching for the E3 which will actually have improved picture quality... [this is what I'll probably do]