28mm is a "non-standard" and would fight a lot more against 35mm. 35mm is the standard and is believed to be a more real representation of human eye. To me, anything else than 35mm is a mistake. If you want to be a part of any "human" event, you would have a 35mm lens with you, and you would want the best you can afford.
As for the second, it is most likely a 24mm. However, If I was Canon, I would go bold and reach for a 20mm. They already struggled to keep the price down on the VCM, they won't try it for 1.2. Personally, that is the magical focal length for environmental portrait and lifestyle storytelling for me, but it looks like everybody struggles to deliver a good one. If Canon is that good, I would challenge it and show the world.