I own a black 28/3.5 Canon in LTM, and I like the better ergonomics of the black version over the chrome 28/3.5 version I owned. While the black version is slightly larger, it also features a real focusing ring.
I would agree that the performance is very much like a modern lens. I paid less than $550.00 for mine, but typically the focus gets stiff on these old lenses, and in the end I had my lens serviced (cleaned and lubed) which cost me an additional $200.00. My lens came with the LTM cap, Canon front cap, and the Canon leather case.
Finding filters that fit is a pain (40mm thread). No hood was ever made for this lens. On my Leica Monochrom it seems to render wonderfully detailed highlights, but perhaps this is at the expense of shadow detail, which is kinda the opposite of my 28 Cron ASPH. I'm glad I have this lens. The Canon 28mm VF'er is kinda nice, but has no brightlines. I still have this VF'er from the chrome 28/3.5, but the 25/28 Zeiss VF'er is the best.
Cal