Linq to SQL generates much slower query - linq-to-sql

Question

I've got a SQL query that when I run it in SQL Server Mgmt Studio takes 15 seconds to complete. When I translate it to linq and run it in LINQPad it takes 1:50 to complete. Have I just completely bungled the "translation" to linq?
This is the SQL:
WITH details AS (
SELECT DISTINCT SerialNumber, OrgLevel3, OrgLevel4, [Status Label]
FROM vw_PSM_AssetIntransit
WHERE yyyyww = DATENAME(yy, GETDATE()) + RIGHT('00' + DATENAME(wk, GETDATE()), 2) AND pro_status <> 'retired'
)
SELECT OrgLevel3, OrgLevel4, COUNT(DISTINCT SerialNumber) Total,
SUM(CASE WHEN [Status Label] NOT IN ('15-21 Days InTransit', '8-14 Days InTransit', 'over 21 Days InTransit') THEN 1 ELSE 0 END) Compliant
FROM details
GROUP BY OrgLevel3, OrgLevel4
ORDER BY 1, 2
and this is the LINQ I translated it to:
var now = DateTime.Now;
var dtf = System.Globalization.DateTimeFormatInfo.CurrentInfo;
var calendar = dtf.Calendar;
var yearWW = now.Year * 100 + calendar.GetWeekOfYear(now, dtf.CalendarWeekRule, dtf.FirstDayOfWeek);
var badStatusLabels = new string[] { "15-21 Days InTransit", "8-14 Days InTransit", "over 21 Days InTransit" };
var details = (
from r in Vw_PSM_AssetIntransit
where r.yyyyww == yearWW && r.Pro_status != "retired"
select new { r.SerialNumber, r.OrgLevel3, r.OrgLevel4, r.StatusLabel }
).Distinct();
var data = from r in details
group r by new { r.OrgLevel3, r.OrgLevel4 } into grp
orderby grp.Key.OrgLevel3, grp.Key.OrgLevel4
select new
{
OrgLevel3 = grp.Key.OrgLevel3,
OrgLevel4 = grp.Key.OrgLevel4,
Total = grp.Select(x => x.SerialNumber).Distinct().Count(),
Compliant = grp.Sum(x => !badStatusLabels.Contains(x.StatusLabel) ? 1 : 0)
};
Console.WriteLine(data);
This is what LINQPad shows the SQL query came out as:
-- Region Parameters
DECLARE #p0 Int = 201816
DECLARE #p1 NVarChar(1000) = 'retired'
DECLARE #p2 NVarChar(1000) = '15-21 Days InTransit'
DECLARE #p3 NVarChar(1000) = '8-14 Days InTransit'
DECLARE #p4 NVarChar(1000) = 'over 21 Days InTransit'
DECLARE #p5 Int = 1
DECLARE #p6 Int = 0
-- EndRegion
SELECT [t3].[OrgLevel3], [t3].[OrgLevel4], (
SELECT COUNT(*)
FROM (
SELECT DISTINCT [t5].[SerialNumber]
FROM (
SELECT DISTINCT [t4].[SerialNumber], [t4].[OrgLevel3], [t4].[OrgLevel4], [t4].[Status Label]
FROM [vw_PSM_AssetIntransit] AS [t4]
WHERE ([t4].[yyyyww] = #p0) AND ([t4].[pro_status] <> #p1)
) AS [t5]
WHERE ((([t3].[OrgLevel3] IS NULL) AND ([t5].[OrgLevel3] IS NULL)) OR (([t3].[OrgLevel3] IS NOT NULL) AND ([t5].[OrgLevel3] IS NOT NULL) AND ((([t3].[OrgLevel3] IS NULL) AND ([t5].[OrgLevel3] IS NULL)) OR (([t3].[OrgLevel3] IS NOT NULL) AND ([t5].[OrgLevel3] IS NOT NULL) AND ([t3].[OrgLevel3] = [t5].[OrgLevel3]))))) AND ((([t3].[OrgLevel4] IS NULL) AND ([t5].[OrgLevel4] IS NULL)) OR (([t3].[OrgLevel4] IS NOT NULL) AND ([t5].[OrgLevel4] IS NOT NULL) AND ((([t3].[OrgLevel4] IS NULL) AND ([t5].[OrgLevel4] IS NULL)) OR (([t3].[OrgLevel4] IS NOT NULL) AND ([t5].[OrgLevel4] IS NOT NULL) AND ([t3].[OrgLevel4] = [t5].[OrgLevel4])))))
) AS [t6]
) AS [Total], [t3].[value] AS [Compliant]
FROM (
SELECT SUM([t2].[value]) AS [value], [t2].[OrgLevel3], [t2].[OrgLevel4]
FROM (
SELECT
(CASE
WHEN NOT ([t1].[Status Label] IN (#p2, #p3, #p4)) THEN #p5
ELSE #p6
END) AS [value], [t1].[OrgLevel3], [t1].[OrgLevel4]
FROM (
SELECT DISTINCT [t0].[SerialNumber], [t0].[OrgLevel3], [t0].[OrgLevel4], [t0].[Status Label]
FROM [vw_PSM_AssetIntransit] AS [t0]
WHERE ([t0].[yyyyww] = #p0) AND ([t0].[pro_status] <> #p1)
) AS [t1]
) AS [t2]
GROUP BY [t2].[OrgLevel3], [t2].[OrgLevel4]
) AS [t3]
ORDER BY [t3].[OrgLevel3], [t3].[OrgLevel4]