Interesting to hear mention of current orchestral standards. I am inclined to agree with makropoulos and his summary of the LSO, LPO and RPO in the last forty years.
I think the regional orchestras and BBCPO are on a high at the moment. The CBSO, RLPO, BSO are as good as they were under the likes of Rattle, Groves and Silvestri. The Halle is as good as when Glorious John was in charge. The BBCPO has been on a high ever since Jan-Pascal Tortelier made them into the best ever French Orchestra. They have changed nationality and are a superb Italian/Russian band now. The BBCNOW and BBCSSO can be extraordinarily good as well. I have not heard the RSNO live for a long time.
The ROHCGO and ENO orchestras are in stupendous states of health. Because they rarely play outside the opera houses we forget how bloody good they are. I would say that Haitink and Pappano have lifted the ROHCGO to the position of joint third best orchestra in Britain. Edward Gardner has maintained the high standards of Paul Daniel, Mark Elder and Charles Mackerras at ENO. Colin Davis and Haitink set similar standards with the LSO. However, I think that the BBCSO has suddenly pulled its socks up to the same level: Jiri Belohlavek is clearly a fine orchestral builder. The top position in my recent experience has to be Esa-Pekka Salonen's Philharmonia which is as high as it was when HvK and Giulini were effectively bosses. I would go as far as saying I do not know any orchestra that can play as well. VPO, BPO, Chicago, Philadelphia...they are mere minnows at the moment.