Basically, what kind of figures do you want? 80 million? 30-40 million? There's people who've floated the latter figure.
When you look at the J-20, the first thing you notice is that it's heavyweight. Roughly 20.4 x 12.9, comparable in size (but not mass) to an F-15 Eagle and slightly smaller than a Flanker, J-11 or Su-27.
Going heavyweight is a choice. A heavyweight fighter, with all other factors being equal, is going to cost more than a middleweight or a light fighter. And fighters aren't like tanks, wherein the heavier your tank, the more survivable your tank is. It only takes a single missile to knock down a F-15, just as much as it takes only a single missile to knock down a F-16.
So when you go heavyweight, you take on drawbacks of cost, but to go heavyweight you also want advantages that justify this cost.
As I've said before, traditionally, a heavyweight fighter, in order to pay for itself, had to achieve good kill-loss ratios versus light and middle-weight fighters. This comes in via the BVR advantages of the heavyweight fighter.compared to the lightweight fighter, although in the 5th generation, differences in IR emissivity can cancel out this factor.
But this is crucial when you look at the J-20. If the J-20 is equal to the F-35 in terms of cost, it becomes viable for the J-20 to counter the F-35 simply by massing the aircraft. A 1:1 kill-loss exchange rate doesn't matter, because eventually the opponent runs out of fighters, or both sides run out of aircraft.
However, if the J-20 is more expensive than the F-35 in terms of cost, it becomes imperative that the J-20 has a qualitative edge over the F-35. There are various dimensions where this is true; i.e, the J-20 will eventually have significantly better dogfighting ability than the F-35 (increased thrust, TVC, canards), and its larger radar and potentially larger IRST system gives it an edge in BVR over the F-35.
In other words, it is DESIRABLE for the J-20 to be more expensive than the F-35. Remember the old design of the J-31? That one incorporated only an EOIRST, and ditched the EODAS to achieve cost savings. If the J-20 is stuck, irredeemably, as more expensive than the F-35, the corner cutting business is NOT a valid strategy for competition. Leave that to the Russians with their Su-57, where the stealth is questionable (i.e, intended to break radar locks by missiles but not to get a detection advantage).
110 million as a target price for the J-20 is actually a very excellent price at this rate. It's 38% more expensive than the current F-35, meaning that it's not wildly more expensive, but neither is it cheap enough to push it into a plane spam category ("I'm going to fly 3,000 J-20s and outnumber your F-35s!).
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I think there's one other way you might consider looking at it.
The F-22 is a joke. It's no longer in production, it's somewhat antiquated (jammed by F-35s), it won't have an IRST until later updates, and is basically orphaned by the USAF. The USAF's strategy is going to be spamming F-35s until the PCA / NGAD enters service.
Now, according to American nationalists, the F-35 can beat the J-20, hands down, because of things like sensor fusion, stealth, etc, and all this stuff the Chinese, according to them, can't figure out.
Their assumption is basically that the Chinese will go to a mass strategy, i.e, get the J-20 cheap and down closer to the cost of an F-16 or F-15, and that the only way the J-20 can win is via numbers.
But that's the shocking thing about the J-20, isn't it? It's a heavyweight fighter. Heavyweights, as I've stated above, are meant to dominate lightweights and middleweights. The Americans can retort that it's a paper plane, and there's this post on the forum stating that the J-20 is more likely to cost $40,000 because it's a paper plane. But if it's $110 million, the strategy is now obvious, that the J-20 is intended to dominate the F-35 just like a heavyweight is supposed to dominate a middleweight or lightweight factor.
Don't play into stereotypes of the Chinese relying on numbers only. The CCTV claim is reasonable and credible because, first, CCTV is unlikely to go into detail about what LRIP is and how LRIP means the J-20's going to be ultra cheap once it hits mass production. Second, by giving a high figure of 110 million, it states that the J-20 was more expensive than the F-35 LRIP in FY2017 (vs 90 million).