The only issue with that AF system is that it's got a little slack. I.e. it might stay that you're in lock a little earlier or a little later than it actually should, whereas if the lens had an AF motor it would automatically select the point in the middle of this range. it's not going to be flat out inaccurate, though. And if you stop the lens down a little bit while you're at it, you'll likely make up for the slack.
My rule of thumb is you should use the AF system for AF confirmation, not determination.
If you use the screen on the back, you can have it blow up the image for you so you can accurately determine whether or not it is in focus, just like on the NEX.
If you're going to be shooting with manual lenses a lot (and I'm assuming you mean manual Pentax lenses, don't get a NEX). Instead, get a split-screen focusing screen as it will let you determine whether or not your image is in focus with next to no effort
Adam
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