Interesting...
Had a similar change to CAI some time ago, and some flights to ex-VIE to DAM/AMM with OS/NG (737-700 and A320 with European seats).
As long as the middle-seat was empty (it always was), I sat comfortable and really didn't have the idea to claim anything. Maybe my demands are a bit lower for a 3,5-4 hours-flight...
LHR-TLV is a different story, as you can add about 1,5 to 2 hours.