@San and imisshotmail, I agree to a certain extent, but you also have to take into consideration that 50% if not more of the maps on the NA1 rotation are city or village, often very closed in and are thus light cav unfriendly maps. This means that far less often your not in control of the encounter and thus subject to more vulnerabilities then advantages when engaged. Furthermore, range particularly on these maps have the ability to set up at unreachable places or "dead ends" often devastating you before or as you are being swarmed by the other team. Not so much of a problem for heavy cav as they generally can plow through mobs and take many projectiles (although maybe not with this new change). Although, on open maps where you can pick your fight there the advantage is again with the cav and the kd does reflect this.
When 1h went op I decided to go 2h heavy cav, 24/15, ((+3)(barbed horse, Serbian with knee caps, plate boots..etc)) and without trying at level 33 I was easily able to go 5/1 sometimes even 10/1 or 10/0 and would make money or if I would lose it would be very little do to banner stack and valor. With my current build it is almost impossible to get those kind of numbers although my overall damage output is generally high my kd is often very low relative to my score (why i feel the lance needs a buff - it is silly, really, when I'm charging full speed and lance a un-helmed guy in the face and he doesn't die, or when my angle is not perfect or I'm not charging full speed and my lance just bounces of some plate guy (especially heavy cav)-). Heavy cav do not have these problems (unless they use the lance -but then you just couch- as you just park or plow your tank up to or into some enemies and start slashing and the numbers really add up when your probably going to survive the whole round doing it. For light cav this kind of behavior would mean instant death. Cav need to be thought of in the same way we think of strength and agility and ranged foot. Light and heavy cav are two completely different classes, and it is silly, perhaps even border line ignorant to group all cav classes together.