My previous three cars before the FR were: Seat Exeo Sport, Volkswagen CC and TT Mk1 V6 (which I still have).
The Exeo had a pulverising ride until I replaced its rubbish tyres, when it became acceptable. The CC was a GT with adjustable dampers which gave a superb ride in Comfort and Normal but had a Sport setting which was nearly as stiff as the Exeo, and therefore totally out of keeping with its laid-back style. I think I used it once.
The TT is, as you might expect, very hard-riding, even harsh at times - but that's forgivable because it's fab in every other respect.
I feared the Leon (on 18s) would be too close to the TT in ride quality, but in fact it fits somewhere between the Exeo and the Normal setting on the CC, and I think that's about right for a sporty hatch. As stated above, I'm sure it's better still on 17s, but mine's second hand so I had no choice in the matter.
I found the ride very bouncy at the rear at first, because some fool had set the pressures at 35psi all round. Knocking them back to 32/29 - as recommended elsewhere on this forum - made a world of difference.