My initial reactions are prejudiced by two things; I can’t yet run Aperture 1.5 because it isn’t available yet, and I downloaded the v4 beta of Lightroom to the new G5 and it completely hosed, so I haven’t had time to look at that either. My understanding is Adobe has further forked “Photoshop Lightroom” from ACR rendering; potentially handling blown highlights better, more flexible white balance (looks like auto does a better job), and some UI cleanup that understandably has people grumbling—things like renaming and relocating tools—considering folks are more treating lightroom like shareware than a beta. I’m not sure how much RAW Shooter RAW conversion is in this; not much I suspect, but I won’t know until I take the time to figure out why it doesn’t work on the G5. I don’t think so though, there just hasn’t been enough time.
And I grumble re Aperture, but all in all there are some solid upgrades in 1.5 for free. The Library system looks really robust now, much more so than Lightroom especially when you consider app integration and upcoming Tiger feature integration and the abstraction layer Apple has introduced between the previews and the RAWs, and the sharpening looks like it will be pretty solid. Also, a subset of Pros will like the Stock up-loader extensibility, and I suspect that plug in architecture will get used heavily; as a bonus for the prosumer/amateur crowd the Flickr type plugins will be welcome as well. The selective color editing reminiscent of Final Cut Pro, Silverfast, and various other editors is a nice touch too. There were a bunch of other little refinements that while nice, I don’t think are very major.
Really, Lightroom’s only real strength at this point is integration with the rest of the Adobe Suite, and I question that value to the prosumer, especially with the relative disarray the suite is currently in (Dreamweaver/GoLive for instance). They did add a nice “run a Photoshop action” hook to the Lightroom batch in v4, however—though arguably you could easily do the same in Aperture with Applescript/automator/automated folders.
[Nearly forgot—Lightroom has added a new tone curve editor with a live histogram that from all descriptions sounds very similar to how Aperture handles curves (their quandrant levels system essentially works like curves in photoshop, just using 5 control points rather than 16)—that sounds fairly intuitive. I actually like Apple’s approach in this regard, but because they are visually representing data in a way most people aren’t accustomed to seeing and manipulating, Apple’s approach can be fairly confusing. Again, this only matters to those that have taken the time to learn Adobe’s curves, but the ideal would be a larger version of Apple’s interface with more flexibility in the number of control points.]