NorthwestF

A57 does very good job of tracking ... here are 100% crops of tracking in action http://sonyalphalab.com/2012/04/sony-a57-12fps-feature-tested-using-new-firmware-sample-pics-w-100-crops/

Is A57, since it doesn't have a mirror, quieter or louder?

Neither K01 nor K30 do fullHD 1080 60p. The resolution in 60 fps mode is 720P The sensor is obviously capable of doing 1080 60p, as all Sony's cameras do 1080 60p

Didn't K-r and K-x have the MLU? From B&H specification...

http://sonyalphalab.com/product-review/sony-alpha-57-slt-a57-hands-on-review-using-multiple-lenses/

The difference is only 0.5 stops, and as you say, not even noticeable before ISO 3200. There are some pluses too, even for still photography, like tracking ability during fast burst mode, shorter...

GH2 video resolution is very good, but the lowlight performance (in video mode) is still several stops behind the newer larger sensor cameras.

No "highend slr camera" can AF in video mode correctly, but here the topic is mirrorless which are not SLRs. The m4/3/ and Nex mirrorless cameras do a reasonable job wih AF in video. Almost all...

http://www.imaging-resource.com/PRODS/PENTAXQ/PENTAXQA.HTM

Any class 10 card should work.. But the fastest cards right now are the 95MB/s one and they are not that expensive on Amazon

Now the mods also know you have two ISPs ..

Doing things like that can lead to permanent ban, including ban on your ISP

ISO 3200 is not everything. Nex-7 images are amazingly good (even better than D4 and 5D III) at lower ISOs

1600 is easily high ISO. It's about the highest that film ever went.

How doe these cameras (A57, A55) perform with class 6 SDHC cards? Any issues with burst mode? Video issues?

Make sure to update the firmware if it's not already http://esupport.sony.com/US/perl/swu-download.pl?mdl=SLTA57&upd_id=7540&os_group_id=3

http://www.dcresource.com/reviews/pentax/k01-review

This may not be a Sony's sensor, see the picture of the sensor here

http://forums.dpreview.com/forums/read.asp?forum=1034&message=41285538

It's not going to score high dynamic range on dxoma

This may not be a Sony's sensor, see the picture of the sensor here

http://forums.dpreview.com/forums/read.asp?forum=1034&message=41285538

It's not going to score high dynamic range on dxomark...

This may not be a Sony's sensor, see the picture of the sensor here

http://forums.dpreview.com/forums/read.asp?forum=1034&message=41285538

It's not going to score high dynamic range on dxomark,...