I'm going to post this as a new thread, as well so that more people can see it. Here are two charts that compare the international success rate of 800/endurance v. 800/sprint runners:
Top 800m Runners who have backgrounds competing at 1500m or longer
Athlete (Nation)800m PR (all-time rank)1500m/mile PR (all-time rank)AccoladesWilson Kipketer (DAN)1:41.11 (1)3:42.80 (Not ranked) /3:59.7 (764)gold 1995/1997/1999 World 800m, silver 2000 OG, 2003 WIC 800mSebastian Coe (GBR)1:41.73 (2)3:29.77 (14)/3:47.33 (9)1980/84 Olympic 800m silver, 1500m gold; 1986 European 800m gold\Joaquim Cruz (BRA)1:41.77 (3)3:34.6 (148)/3:53.00 (113)1984 Olympic 800m gold, 1988 Olympic 800m silverSammy Koskei (KEN)1:42.28 (4)3:38.50 (603) Vebjørn Rodal (NOR)1:42.58 (5)3:37.57 (421)1996 Olympic 800m goldAndré Bucher (SUI)1:42.55 (7)3:38.44 (589)2001 World 800m gold*Hezekiél Sepeng (RSA)1:42.69 (11)3:38.24 (541)800m silver 1994/98 CWG, 96 Olympic Games, 1999 World ChampionshipsJapheth Kimutai (KEN)1:42.69 (12)3:34.14 (125)1998 Commonwealth 800m goldSteve Cram (GBR)1:42.88 (16)3:29.67 (12)/3:46.32 (4)1983 1500m gold, 1982/1986 Commonwealth & European 1500m gold, 800m bronzeMbulaeni Mulaudzi (RSA)1:42.89 (17)3:39.70 (Not ranked)800m gold 2002 CWG, 2004 World Indoors, bronze 2003 World ChampionshipsWilliam Yiampoy (KEN)1:43.00 (19)3:34.12 (122)4th 2001 World Championships 800mPeter Elliot (GBR)1:42.97 (18)3:32.69 (58)Gold 1990 CWG 1500m, silver 1987 WC, 1988 Olympic 800mJosé Luiz Barbosa (BRA)1:43.08 (23)3:37.04 (360)800m bronze/silver 1987/1991 World Championships Benson Koech (KEN)1:43.17 (29)3:32.09 (62)1992 World Junior 800m goldMehdi Baala (FRA)1:43.15 (27)3:28.98 (6)1500m gold 2002 European Champs., silver 2003 World Champs., bronze 2002 World CupWilliam Tanui (KEN)1:43.30 (31)3:30.58 (18)1992 Olympic 800m goldNixon Kiprotich (KEN)1:43.31 (32)3:38.76 (665)Silver 1990 CWG, 1992 Olympic 800mWilliam Chirchir (KEN)1:43.33 (33)3:29.29 (8)2002 Commonwealth 1500m silverRich Kenah (USA)1:43.38 (36)3:37.63 (434)Silver 1997 World Indoor, Outdoor 800mRick Wohlhuter (USA)1:43.5h (41)3:53.3h (127)1976 Olympic 800m bronzeRob Druppers (NED)1:43.56 (45)3:35.07 (169)1983 WC 800m silverMike Boit (KEN)1:43.57 (46)3:33.67 (89)1972 Olympic 800m bronzeAbdi Bile (SOM)1:43.60 (48)3:30.55 (19)1987 World Championship 1500m goldEarl Jones (USA)1:43.62 (49)3:36.19 (266)1984 Olympic 800m bronzeLaban Rotich (KEN)1:43.65 (51)3:29.91 (13)/3:47.65 (10)1998 World Cup 1500m gold, 1999 World Indoor 1500m silverAndrea Longo (ITA)1:43.74 (55)3:39.46 (Not ranked)1997 European Under-23 800m gold, 1998 European cup 800m gold
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Table of top 800m runners with backrounds of competing at 400m or shorter
Athlete (Nation)800m PR (all-time rank)400m PR (all-time rank)AccoladesPatrick Ndururi (KEN)1:42.62 (10)45.71A (553)7th in 1997 World 800m Champ.Norberto Téllez (CUB)1:42.85 (12)45.27 (260)1996 Olympic 800m silverFrederick Onyancha (KEN)1:42.79 (13)45.2hA1996 Olympic 800m bronzeBilly Konchellah (KEN)1:43.06 (18)45.38A (321)1987/1991 World 800m goldPaul Ereng (KEN)1:43.16 (21)45.6 (490)1988 800m Olympic goldMark Everett (USA)1:43.20 (24)44.59 (53)9 time USA championAlberto Juanterrena (CUB)1:43.44 (33)44.26 (18)1976 Olympic 400m/800m gold
From these observations, I might conclude that a.) it's more likely to run better at 800m with an endurance background and b.) in order to run well internationally at 800m as a long sprinter, you need a minimum of mid45s 400m speed.
Enjoy.