For Lightroom 4...
I've been a long time user of Lr, starting with the first beta and I mostly love it.
It was only recently I tried Aperture 3, I wrote an indepth review of Lr 3 vs Aperture 3 (and others) here:
http://www.twin-pixels.com/raw-processors-review-aperture-bibble-capture-one-dxo-lightroom/
1. One thing I really like in Aperture is how nicely integrated the browse/library mode is, compared with Lightroom.
In Aperture, you can edit a picture while in Browse mode (as opposed to Lightroom's Quick Develop, which is pretty much useless). I'd love being able to get into Compare/Survey and still have full control over processing. I also find it confusing that some options are available while in Library mode but not in Develop mode. Things have improved since V1 but I still find the separation between Library and Develop as too artificial and having seen Aperture, I'm sure Lightroom can do better.
2. Another thing from Aperture I'd love to see is how if you have several images selected and change the let's say the Exposure, all images are updated. I know we have Sync and Copy from Previous but again there's room for improvement.
3. The perspective correction is very powerful but sometimes hard to do, especially when you need to alter all three axes. Here I'd like to see a keystoning tool like in DxO.
4. The purple fringing correction is not very powerful, compared to other programs. Capture One and DxO work on high radii and they seem to correct the luminance in the affected areas as well.
4. Speaking of tools, how about more brushes? Like a Noise brush or a WB brush. How great would it be to be able to make local adjustments to WB.
These are my most important suggestions and I made them not to bash Lightroom, but because I want it to be THE tool for processing Raws.
