It's not even CLOSE. The Yonex RQ-180 has an extremely exaggerated ball pocketing effect that the RDX Mid doesn't even come close to approaching. The throat on this stick flexes like nothing I've tried including the RD-7 which is second place in this regard. The OPS on the RQ-180 is extremely pronounced and aggressively shaped.
Btw, having owned and been sponsored by Head before, I've used all the Prestiges, 280s, Radical Tours, Pyramid Tours, etc. NONE of them give a "sinking" feeling in my opinion, magical-mystical twaron properties or not. They may give a flexible feeling, but that's a totally different distinction from a sinking feeling in my opinion. Flexible feeling rackets have a more uniform flex response, they feel soft, but they don't give that cupping/catpult/lingering sling shot/type effect of OPS rackets, particularly strung low, or swung hard enough to make for a crushing impact response.
The RD-7 and RQ-180 more so than any other rackets I've tried, have this feeling. The RD-3 which has the same mold as the RD-7...except for one KEY thing...the oval pressed shaft which is designed to flex the racket at the throat/shaft area on impact...does not. The RD-3 is a fiberglass filled graphite racket that is noticeably more flexible than the RD-7 which is already one of the most flexible modern rackets ever made. The RD-3 then by comparison is beyond flexible by today's standards. HOWEVER, it does not have that cupping/sinking in feel like the RD-7. The flex is homogenous and in that sense the racket gives a firmer, more predictable response on impact. By firm, I don't mean stiff or crisp per say, I mean think of it like hitting with one of those plastic cutting boards. They have a certain give and softness to them, yet are still a solid one piece object. That's what it feels like hitting with. It's like the difference between a cushy bed but standard bed vs. a memory foam design. One contours to you and is more dynamically reactive. The former is not better or worse, just a different design. Both are soft, but just in different ways. It's what you prefer.