Yes, it is, as far as the major players go. Technically Brighthouse has a couple more. But I think they're only in parts of Florida, Alabama and a few other states.
I have Charter Spectrum and do indeed have about 200 HD channels in my lineup (some are sports, foreign or premiums I don't subscribe to). About two years ago, when I first signed up, they had about 100, then several months later 160, and a few months ago with the analog shut-down and introduction of Spectrum, went up to 200.
HERE's a pretty accurate and up to date list showing DirecTV/Dish/Comcast having 141/137/140 respectively.
While I get far more HD than I ever got with Dish or DirecTV when I had them a few years ago, that number does have some fluff. It includes all the west coast premium feeds as well as a bunch of shopping and religious channels. But there are some decent channels the other guys don't have, like, in DirecTV's case:
American Heroes (used to be Military Channel I think)
AWE
BBC World News
C-SPAN (and 2 and 3)
ESPN Goal Line
Esquire
Fuse
Fusion
FX Movie
GolTV
Great American Country
GSN
Hub
MavTV
MTV2
Nick Jr.
Nicktoons
Outdoor
Oxygen
Pivot
Reelz
RFD
Sportsman
Sprout
Sundance
TV One
TV Guide Network
UP
WE tv
Encore Action, Black, Classic, Suspense
Epix
MoviePlex
IndiePlex
RetroPlex
If you're curious about picture quality, I can tell you the HD is every bit as good as OTA and DirecTV and noticeably better than Dish. The SD picture quality is far better than DirecTV. And since I use a cable card 4 tuner whole home DVR system of my own (5 TVs in my house), I pay no DVR service or equipment fees besides the $2 card. So my bill is about half what it was with satellite, and I get far more channels. And with cable, I get most of my local sub-channels, so no more OTA required as it was with satellite.
Charter has made an incredible turn around in the past few years. Just 3-4 years ago, in my market at least, Charter had a grand total of about 20 HD channels that looked like poor quality SD channels. And their SD channels were unwatchable. Now they blow everybody (except FIOS) out of the water.
One caveat is their DVR interface looks like the Atari had in the 70's. It's nothing like what you may have had on satellite. So if you do get Charter, bring your own DVR (Tivo or WMC). Supposedly a big software upgrade is rolling out nationwide soon, but I'll believe that when I see it. Another caveat is they don't have Sunday Ticket. So if you can't live without that, you're stuck with DirecTV. I'm not a big sports guy, so I don't really know how Charter compares. But you can see exactly what they have on the chart linked above.
I'm very glad Dish dropped AMC for a while a few years ago. That's what prompted me to cancel and look at cable again. I've probably saved thousands in that time and gotten a lot more HD. I know I sound like a shill, but having had DirecTV, Dish and Charter on and off for the past 30 years or so, Charter today is by far the best.