As great an improvement as the new comparison view is, there is a little issue when removing models from the comparison view and then comparing with different size previews.
For example, when removing 1 of 4 models to reduce the comparison down to 3 models, then one preview is naturally larger than the other two which in turn then prevents those smaller previews from showing all of the image, as the preview frame moves to the upper or lower edges of the original image gets stopped by the larger preview window.
Not that this is a big deal, as this can sort of be prevented by removing another model reducing the comparison down to two identically sized previews, but it might be very simple to resolve, by simply allowing the two smaller preview windows to move all the way out to the edges of the image when moving the preview around the original image.